Loading ...
Sorry, an error occurred while loading the content.

Re: Trouble configuring backup MX to reject unauth destination

Expand Messages
  • Wietse Venema
    ... With the domain defined in virtual_mailbox_domains, mail will fail with user unknown in virtual mailbox table when the recipient is not found in
    Message 1 of 28 , Mar 22, 2013
    • 0 Attachment
      Titanus Eramius:
      > Fri, 22 Mar 2013 16:55:21 -0400 (EDT) skrev Wietse Venema
      > > Where is cogky.dk defined: mydestination, virtual_alias_domains,
      > > virtual_mailbox_domains, relay_domains? It must be only one.
      > >
      > > This answer determines where the "known" recipients must be listed:
      > > local_recipient_maps, virtual_alias_maps,m virtual_mailbox_maps,
      > > relay_recipients. If you list the domain or recipients in the wrong
      > > place then mail will be rejected.
      > >
      > > See http://www.postfix.org/ADDRESS_CLASS_README.html
      >
      > The goal is a "virtual only" mailserver, so the domains is stored
      > in MySQL and fetched through virtual_mailbox_domains. Besides
      > virtual_mailbox_domains, I use virtual_mailbox_maps and
      > virtual_alias_maps.

      With the domain defined in virtual_mailbox_domains, mail will fail
      with "user unknown in virtual mailbox table" when the recipient is
      not found in virtual_mailbox_maps. This is described in agonizing
      detail in ADDRESS_CLASS_README.

      Test your lookups:

      postmap -q cogky.dk the-virtual_mailbox_domains-table
      This should return a result (the value does not matter).

      postmap -q real-user@... the-virtual_mailbox_maps-table
      This should return a result (the mailbox file name).

      postmap -q bogus-user@... the-virtual_mailbox_maps-table
      This should return no result (Postfix treats this as "user unknown
      in virtual mailbox table").

      Wietse
    • mouss
      ... one possible reason is that you configured a wildcard alias: @cogky.dk == @aptget.dk (that is anything to cogky maps to same address in aptget.dk). if so,
      Message 2 of 28 , Mar 24, 2013
      • 0 Attachment
        Le 23/03/2013 00:02, Titanus Eramius a écrit :
        > [snip]
        > The goal is a "virtual only" mailserver, so the domains is stored
        > in MySQL and fetched through virtual_mailbox_domains. Besides
        > virtual_mailbox_domains, I use virtual_mailbox_maps and
        > virtual_alias_maps.
        >
        > The documentation is among the best documentation I have seen, but I
        > can't seem to find the solution, even though I have read most of what I
        > could find in relation to virtual handling.
        >
        > One more "clue" is the error messages when sending to non-existent
        > users. When sending to aptget.dk Postfix responds with
        > "550 5.1.1 <non_existent@...>: Recipient address rejected: User
        > unknown in virtual mailbox table".
        >
        > When sending to cogky.dk the response is only "<non_existent@...>:
        > user unknown"
        >

        one possible reason is that you configured a wildcard alias:
        @... ==> @...
        (that is anything to cogky maps to same address in aptget.dk).

        if so, that's your problem. you need to configure mappings only for
        existing users.
        since you use mysql, this should be easy to do.
      • Titanus Eramius
        Fri, 22 Mar 2013 19:12:40 -0400 (EDT) skrev Wietse Venema ... aptget:~# postalias -q cogky.dk mysql:/etc/postfix/mysql_virtual_mailbox_domains.cf cogky.dk ...
        Message 3 of 28 , Mar 25, 2013
        • 0 Attachment
          Fri, 22 Mar 2013 19:12:40 -0400 (EDT) skrev Wietse Venema
          <wietse@...>:

          > Test your lookups:
          >
          > postmap -q cogky.dk the-virtual_mailbox_domains-table
          > This should return a result (the value does not matter).

          aptget:~# postalias -q cogky.dk
          mysql:/etc/postfix/mysql_virtual_mailbox_domains.cf
          cogky.dk

          > postmap -q real-user@... the-virtual_mailbox_maps-table
          > This should return a result (the mailbox file name).

          aptget:~# postalias -q real-user@...
          mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
          cogky.dk/real-user/

          > postmap -q bogus-user@... the-virtual_mailbox_maps-table
          > This should return no result (Postfix treats this as "user unknown
          > in virtual mailbox table").

          And this does not return a result. Bash gives a error-status of 1.


          Sun, 24 Mar 2013 09:36:03 +0100 skrev mouss <mouss@...>:

          > one possible reason is that you configured a wildcard alias:
          > @... ==> @...
          > (that is anything to cogky maps to same address in aptget.dk).

          As far as I can see that should not be the case. All addresses and
          aliases in the database have a left hand side to it. Is there a way to
          test this?


          I'm using Dovecot 2 as LDA for final delivery and IMAP-services, so
          "virtual_transport" is set to "dovecot" in main.cf and the following
          lines are in master.cf:

          dovecot unix - n n - - pipe
          flags=DRhu user=vmail:vmail argv=/usr/lib/dovecot/deliver -d
          ${recipient}


          When looking through the log, it looks like the "user unknown"
          response comes from Dovecot and not Postfix:

          Mar 25 13:43:53 aptget postfix/smtpd[24133]: connect from
          unknown[92.243.255.38]

          Mar 25 13:43:54 aptget postfix/smtpd[24133]:
          Anonymous TLS connection established from unknown[92.243.255.38]: TLSv1
          with cipher DHE-RSA-AES128-SHA (128/128 bits)

          Mar 25 13:43:54 aptget dovecot: auth-worker(24136): mysql(localhost):
          Connected to database postfix

          Mar 25 13:43:54 aptget postfix/smtpd[24133]: BB6AD371DDC4:
          client=unknown[92.243.255.38], sasl_method=LOGIN,
          sasl_username=HIDDEN_USER@...

          Mar 25 13:43:54 aptget postfix-policyd: connection from: 127.0.0.1
          port: 48937 slots: 0 of 4096 used

          Mar 25 13:43:54 aptget postfix-policyd: connecting to mysql database:
          localhost

          Mar 25 13:43:54 aptget postfix-policyd: connected..

          Mar 25 13:43:54 aptget postfix-policyd: rcpt=16, throttle=clear(a),
          host=92.243.255.38, from=titanus@..., to=unknown-user@...,
          size=365/26214400, quota=365/1800000000, count=1/125(10),
          rcpt=1/600(11), threshold=0%|0%|0%, sasl_username=HIDDEN_USER@...

          Mar 25 13:43:54 aptget postfix/cleanup[24138]: BB6AD371DDC4:
          message-id=<20130325134351.5c2e026f@...>

          Mar 25 13:43:54 aptget postfix/qmgr[23982]: BB6AD371DDC4:
          from=<titanus@...>, size=663, nrcpt=1 (queue active)

          Mar 25 13:43:55 aptget postfix/pipe[24140]: BB6AD371DDC4:
          to=<unknown-user@...>, relay=dovecot, delay=0.38,
          delays=0.26/0.03/0/0.09, dsn=5.1.1, status=bounced (user unknown)

          Mar 25 13:43:55 aptget postfix/cleanup[24138]: 16228371DE3E:
          message-id=<20130325124355.16228371DE3E@...>

          Mar 25 13:43:55 aptget postfix/bounce[24142]: BB6AD371DDC4: sender
          non-delivery notification: 16228371DE3E

          Mar 25 13:43:55 aptget postfix/qmgr[23982]: 16228371DE3E: from=<>,
          size=2673, nrcpt=1 (queue active)

          Mar 25 13:43:55 aptget postfix/qmgr[23982]: BB6AD371DDC4: removed

          Mar 25 13:43:55 aptget postfix/smtpd[24133]: disconnect from
          unknown[92.243.255.38]


          Thank you again for helping
          Titanus


          postconf -n
          alias_maps = hash:/etc/aliases

          bounce_template_file = /etc/postfix/bounce.cf

          broken_sasl_auth_clients = yes

          config_directory = /etc/postfix

          delay_warning_time = 4

          disable_vrfy_command = yes

          dovecot_destination_recipient_limit = 1

          inet_interfaces = 46.21.105.38

          local_recipient_maps = $virtual_mailbox_maps

          mailman_destination_recipient_limit = 1

          maximal_queue_lifetime = 15

          message_size_limit = 26214400

          mydestination = localhost

          mydomain = aptget.dk

          myhostname = aptget.aptget.dk

          mynetworks = 127.0.0.0/8

          postscreen_dnsbl_action = enforce
          postscreen_dnsbl_sites = truncate.gbudb.net*2 b.barracudacentral.org*1
          zen.spamhaus.org*1 bl.spamcop.net*1

          postscreen_dnsbl_threshold = 2

          postscreen_greet_action = enforce

          recipient_canonical_classes = envelope_recipient

          recipient_canonical_maps = hash:/etc/postfix/pfix-no-srs.cf,
          tcp:127.0.0.1:10002

          sender_canonical_classes = envelope_sender

          sender_canonical_maps = hash:/etc/postfix/pfix-no-srs.cf,
          tcp:127.0.0.1:10001

          smtp_tls_security_level = may

          smtp_tls_session_cache_database =
          btree:$data_directory/smtp_tls_session_cache

          smtpd_data_restrictions = reject_unauth_pipelining,
          reject_multi_recipient_bounce,

          smtpd_helo_required = yes

          smtpd_recipient_restrictions = reject_non_fqdn_sender,
          reject_non_fqdn_recipient, reject_unknown_sender_domain,
          reject_unknown_recipient_domain, reject_unauth_destination,

          smtpd_sasl_auth_enable = yes

          smtpd_sasl_exceptions_networks = $mynetworks

          smtpd_sasl_path = private/auth

          smtpd_sasl_security_options = noanonymous

          smtpd_sasl_type = dovecot

          smtpd_tls_ask_ccert = yes

          smtpd_tls_cert_file = /etc/ssl/self-signed/smtpd.crt

          smtpd_tls_key_file = /etc/ssl/self-signed/smtpd.key

          smtpd_tls_loglevel = 1

          smtpd_tls_received_header = yes

          smtpd_tls_security_level = may

          smtpd_tls_session_cache_database =
          btree:$data_directory/smtpd_tls_session_cache

          spamassassin_destination_recipient_limit = 1

          tls_random_source = dev:/dev/urandom

          transport_maps = hash:/etc/postfix/transport.cf

          virtual_alias_maps =
          proxy:mysql:/etc/postfix/mysql_virtual_alias_maps.cf

          virtual_gid_maps = static:5000

          virtual_mailbox_base = /home/vmail

          virtual_mailbox_domains =
          proxy:mysql:/etc/postfix/mysql_virtual_domains_maps.cf

          virtual_mailbox_maps =
          proxy:mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf

          virtual_transport = dovecot

          virtual_uid_maps = static:5000
        • Wietse Venema
          ... OK, the table is working as it should. Now let s find out why the bogus recipient is accepted: Next step: - Connect to the public (not content
          Message 4 of 28 , Mar 25, 2013
          • 0 Attachment
            Titanus Eramius:
            > Fri, 22 Mar 2013 19:12:40 -0400 (EDT) skrev Wietse Venema
            > <wietse@...>:
            >
            > > Test your lookups:
            > >
            > > postmap -q cogky.dk the-virtual_mailbox_domains-table
            > > This should return a result (the value does not matter).
            >
            > aptget:~# postalias -q cogky.dk
            > mysql:/etc/postfix/mysql_virtual_mailbox_domains.cf
            > cogky.dk
            >
            > > postmap -q real-user@... the-virtual_mailbox_maps-table
            > > This should return a result (the mailbox file name).
            >
            > aptget:~# postalias -q real-user@...
            > mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
            > cogky.dk/real-user/
            >
            > > postmap -q bogus-user@... the-virtual_mailbox_maps-table
            > > This should return no result (Postfix treats this as "user unknown
            > > in virtual mailbox table").
            >
            > And this does not return a result. Bash gives a error-status of 1.

            OK, the table is working as it should. Now let's find out
            why the bogus recipient is accepted:

            Next step:

            - Connect to the public (not content re-injection) SMTP port and try

            $ telnet hostname 25
            ehlo ...
            mail from:<>
            rcpt to:<real-user@...>
            rcpt to:<bogus-user@...>
            quit

            One recipient should be accepted, the other not.

            - Same experiment for mail over the submission port, if you have one:

            $ openssl s_client -starttls smtp -connect hostname:587
            ehlo ...
            mail from:<>
            rcpt to:<real-user@...>
            rcpt to:<bogus-user@...>
            quit

            This is just in case.

            Wietse
          • Titanus Eramius
            Mon, 25 Mar 2013 11:30:41 -0400 (EDT) skrev Wietse Venema ... Both RCPT TOs are successful titanus@asrock:~$ telnet 46.21.105.38 25 Trying 46.21.105.38...
            Message 5 of 28 , Mar 25, 2013
            • 0 Attachment
              Mon, 25 Mar 2013 11:30:41 -0400 (EDT) skrev Wietse Venema
              <wietse@...>:

              > Titanus Eramius:
              > > Fri, 22 Mar 2013 19:12:40 -0400 (EDT) skrev Wietse Venema
              > > <wietse@...>:
              > >
              > > > Test your lookups:
              > > >
              > > > postmap -q cogky.dk the-virtual_mailbox_domains-table
              > > > This should return a result (the value does not matter).
              > >
              > > aptget:~# postalias -q cogky.dk
              > > mysql:/etc/postfix/mysql_virtual_mailbox_domains.cf
              > > cogky.dk
              > >
              > > > postmap -q real-user@... the-virtual_mailbox_maps-table
              > > > This should return a result (the mailbox file name).
              > >
              > > aptget:~# postalias -q real-user@...
              > > mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
              > > cogky.dk/real-user/
              > >
              > > > postmap -q bogus-user@... the-virtual_mailbox_maps-table
              > > > This should return no result (Postfix treats this as "user unknown
              > > > in virtual mailbox table").
              > >
              > > And this does not return a result. Bash gives a error-status of 1.
              >
              > OK, the table is working as it should. Now let's find out
              > why the bogus recipient is accepted:
              >
              > Next step:
              >
              > - Connect to the public (not content re-injection) SMTP port and try
              >
              > $ telnet hostname 25
              > ehlo ...
              > mail from:<>
              > rcpt to:<real-user@...>
              > rcpt to:<bogus-user@...>
              > quit
              >
              > One recipient should be accepted, the other not.
              >
              > - Same experiment for mail over the submission port, if you have one:
              >
              > $ openssl s_client -starttls smtp -connect hostname:587
              > ehlo ...
              > mail from:<>
              > rcpt to:<real-user@...>
              > rcpt to:<bogus-user@...>
              > quit
              >
              > This is just in case.
              >
              > Wietse

              Both RCPT TOs are successful

              titanus@asrock:~$ telnet 46.21.105.38 25
              Trying 46.21.105.38...
              Connected to 46.21.105.38.
              Escape character is '^]'.
              220 aptget.aptget.dk ESMTP Postfix
              EHLO Hej
              250-aptget.aptget.dk
              250-PIPELINING
              250-SIZE 26214400
              250-ETRN
              250-STARTTLS
              250-AUTH PLAIN LOGIN
              250-AUTH=PLAIN LOGIN
              250-ENHANCEDSTATUSCODES
              250-8BITMIME
              250 DSN
              MAIL FROM:<>
              250 2.1.0 Ok
              RCPT TO:<real-user@...>
              250 2.1.5 Ok
              RCPT TO:<non-existent@...>
              250 2.1.5 Ok
              QUIT
              221 2.0.0 Bye
              Connection closed by foreign host.

              If non-existent@... is substituted with non-existent@...,
              then it is still rejected with "... unknown in virtual mailbox table".

              When trying with submission through telnet, I'm afraid I can't get the
              syntax right. But when using the mail client Claws Mail, Postfix
              accepts non-existent addresses for cogky.dk

              ...
              [17:51:52] ESMTP< 235 2.7.0 Authentication successful
              [17:51:52] ESMTP> MAIL FROM:<nicky@...> SIZE=371
              [17:51:52] SMTP< 250 2.1.0 Ok
              [17:51:52] SMTP> RCPT TO:<non-existent@...>
              [17:51:52] SMTP< 250 2.1.5 Ok
              ...

              Thank you, Titanus
            • Wietse Venema
              ... You appear to have a wild-card rule that replaces @cogky.dk with @aptget.dk. Such a rule matches all addresses including invalid ones. Instead use a MySQL
              Message 6 of 28 , Mar 25, 2013
              • 0 Attachment
                Titanus Eramius:
                > > OK, the table is working as it should. Now let's find out
                > > why the bogus recipient is accepted:
                > >
                > > Next step:
                > >
                > > - Connect to the public (not content re-injection) SMTP port and try
                ...
                > MAIL FROM:<>
                > 250 2.1.0 Ok
                > RCPT TO:<real-user@...>
                > 250 2.1.5 Ok
                > RCPT TO:<non-existent@...>
                > 250 2.1.5 Ok

                > If non-existent@... is substituted with non-existent@...,
                > then it is still rejected with "... unknown in virtual mailbox table".

                You appear to have a wild-card rule that replaces @... with
                @.... Such a rule matches all addresses including invalid ones.

                Instead use a MySQL query as decribed in
                http://tech.groups.yahoo.com/group/postfix-users/message/247913

                Wietse
              • Titanus Eramius
                Mon, 25 Mar 2013 14:09:04 -0400 (EDT) skrev Wietse Venema ... Thank you for the link, it was very informative, but didn t solve the problem. I also tried
                Message 7 of 28 , Apr 5, 2013
                • 0 Attachment
                  Mon, 25 Mar 2013 14:09:04 -0400 (EDT) skrev Wietse Venema
                  <wietse@...>:

                  > Titanus Eramius:

                  > > MAIL FROM:<>
                  > > 250 2.1.0 Ok
                  > > RCPT TO:<real-user@...>
                  > > 250 2.1.5 Ok
                  > > RCPT TO:<non-existent@...>
                  > > 250 2.1.5 Ok
                  >
                  > > If non-existent@... is substituted with non-existent@...,
                  > > then it is still rejected with "... unknown in virtual mailbox
                  > > table".
                  >
                  > You appear to have a wild-card rule that replaces @... with
                  > @.... Such a rule matches all addresses including invalid ones.
                  >
                  > Instead use a MySQL query as decribed in
                  > http://tech.groups.yahoo.com/group/postfix-users/message/247913
                  >
                  > Wietse

                  Thank you for the link, it was very informative, but didn't solve the
                  problem. I also tried making a virtual_mailbox_maps MySQL query that
                  always returned false, but Postfix still accepted all mail, and then
                  bounced it after Dovecot rejected it.

                  I have converted virtual_mailbox_maps and virtual_mailbox_domains to
                  textfiles, so it should be easier to debug on the setup. Please note
                  that I had to change server to experiment like this, since I depend
                  on the other server.

                  The servername is nt-data.dk, and the hosted domain (which all mail is
                  accepted for) is nt-backup.dk. The behavior is the same, so mail sent
                  to non_existent@... is rejected, while mail sent to
                  non_existent@... is accepted, and then bounced.

                  In main.cf (please see the bottom for postconf -n) is
                  virtual_mailbox_domains =
                  hash:/etc/postfix/virtual_mailbox_domains.cf
                  virtual_mailbox_maps =
                  hash:/etc/postfix/virtual_mailbox_maps.cf

                  And the content of those files is
                  virtual_mailbox_domains.cf:
                  nt-backup.dk OK
                  nt-data.dk OK

                  virtual_mailbox_maps.cf:
                  test@... OK
                  info@... OK

                  It all works like a charm, besides the point that Postfix accepts
                  mail to non-existent users on the hosted domain.

                  In addition I have read through the relevant documentation again, but I
                  still can't figure out where or what the problem might be.

                  Thanks again


                  postconf -n
                  alias_maps = hash:/etc/aliases

                  bounce_template_file = /etc/postfix/bounce.cf

                  broken_sasl_auth_clients = yes

                  config_directory = /etc/postfix

                  delay_warning_time = 4

                  disable_vrfy_command = yes

                  inet_interfaces = all

                  local_recipient_maps = $virtual_mailbox_maps

                  maximal_queue_lifetime = 15

                  mydestination =

                  myhostname = ntdata.nt-data.dk

                  mynetworks = 127.0.0.0/8

                  recipient_canonical_classes = envelope_recipient

                  recipient_canonical_maps = hash:/etc/postfix/pfix-no-srs.cf,
                  tcp:127.0.0.1:10002

                  sender_canonical_classes = envelope_sender

                  sender_canonical_maps = hash:/etc/postfix/pfix-no-srs.cf,
                  tcp:127.0.0.1:10001

                  smtp_tls_security_level = may

                  smtp_tls_session_cache_database =
                  btree:$data_directory/smtp_tls_session_cache

                  smtpd_data_restrictions =
                  reject_unauth_pipelining,
                  reject_multi_recipient_bounce,
                  permit

                  smtpd_helo_required = yes

                  smtpd_recipient_restrictions =
                  reject_non_fqdn_sender,
                  reject_non_fqdn_recipient,
                  reject_unknown_sender_domain,
                  reject_unknown_recipient_domain,
                  reject_rbl_client truncate.gbudb.net,
                  reject_unauth_destination,
                  permit

                  smtpd_sasl_auth_enable = yes

                  smtpd_sasl_exceptions_networks = $mynetworks

                  smtpd_sasl_path = private/auth

                  smtpd_sasl_security_options = noanonymous

                  smtpd_sasl_type = dovecot

                  smtpd_tls_ask_ccert = yes

                  smtpd_tls_cert_file = /etc/ssl/self-signed/smtpd.crt

                  smtpd_tls_key_file = /etc/ssl/self-signed/smtpd.key

                  smtpd_tls_loglevel = 1

                  smtpd_tls_received_header = yes

                  smtpd_tls_security_level = may

                  smtpd_tls_session_cache_database =
                  btree:$data_directory/smtpd_tls_session_cache

                  tls_random_source = dev:/dev/urandom

                  transport_maps = hash:/etc/postfix/transport.cf

                  virtual_mailbox_domains = hash:/etc/postfix/virtual_mailbox_domains.cf

                  virtual_mailbox_maps = hash:/etc/postfix/virtual_mailbox_maps.cf

                  virtual_transport = dovecot
                • Brian Evans
                  ... You say you return false ? Postfix expects to receive no results (a.k.a. 0 rows) if a virtual_mailbox_maps address in mysql does not exist. Do not return
                  Message 8 of 28 , Apr 5, 2013
                  • 0 Attachment
                    On 4/5/2013 6:56 AM, Titanus Eramius wrote:
                    > Mon, 25 Mar 2013 14:09:04 -0400 (EDT) skrev Wietse Venema
                    > <wietse@...>:
                    >
                    >> Titanus Eramius:
                    >>> MAIL FROM:<>
                    >>> 250 2.1.0 Ok
                    >>> RCPT TO:<real-user@...>
                    >>> 250 2.1.5 Ok
                    >>> RCPT TO:<non-existent@...>
                    >>> 250 2.1.5 Ok
                    >>> If non-existent@... is substituted with non-existent@...,
                    >>> then it is still rejected with "... unknown in virtual mailbox
                    >>> table".
                    >> You appear to have a wild-card rule that replaces @... with
                    >> @.... Such a rule matches all addresses including invalid ones.
                    >>
                    >> Instead use a MySQL query as decribed in
                    >> http://tech.groups.yahoo.com/group/postfix-users/message/247913
                    >>
                    >> Wietse
                    > Thank you for the link, it was very informative, but didn't solve the
                    > problem. I also tried making a virtual_mailbox_maps MySQL query that
                    > always returned false, but Postfix still accepted all mail, and then
                    > bounced it after Dovecot rejected it.

                    You say you return "false"?
                    Postfix expects to receive no results (a.k.a. 0 rows) if a
                    virtual_mailbox_maps address in mysql does not exist.
                    Do not return "false", empty string, null, or any other value if it does
                    not exist.

                    Brian
                  • Titanus Eramius
                    Fri, 05 Apr 2013 08:49:39 -0400 skrev Brian Evans ... False may be the wrong word, and I m sorry if it is. What I mean is, virtual_mailbox_maps always returns
                    Message 9 of 28 , Apr 5, 2013
                    • 0 Attachment
                      Fri, 05 Apr 2013 08:49:39 -0400 skrev Brian Evans
                      <grknight@...>:

                      > > Thank you for the link, it was very informative, but didn't solve
                      > > the problem. I also tried making a virtual_mailbox_maps MySQL query
                      > > that always returned false, but Postfix still accepted all mail,
                      > > and then bounced it after Dovecot rejected it.
                      >
                      > You say you return "false"?
                      > Postfix expects to receive no results (a.k.a. 0 rows) if a
                      > virtual_mailbox_maps address in mysql does not exist.
                      > Do not return "false", empty string, null, or any other value if it
                      > does not exist.

                      False may be the wrong word, and I'm sorry if it is. What I mean is,
                      virtual_mailbox_maps always returns nothing from MySQL, like so:

                      titanus@ntdata:/etc/postfix$ sudo postmap -q test@...
                      mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
                      titanus@ntdata:/etc/postfix$ echo $?
                      1
                      (this user exists)

                      titanus@ntdata:/etc/postfix$ sudo postmap -q non_existent@...
                      mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
                      titanus@ntdata:/etc/postfix$ echo $?
                      1
                      (this user does not)

                      I did this because I had some trouble constructing the query-string
                      Wietse recommended, and thought this would be a simple and easy way to
                      test if virtual_mailbox_maps was the problem.

                      When trying the syntax within the MySQL CLI, a "Empty set" is returned
                      when querying for a non-existent user

                      mysql> SELECT username FROM mailbox
                      -> WHERE username = 'non_existent@...';
                      Empty set (0.00 sec)


                      I hope this better explains what I meant
                      Cheers
                    • Titanus Eramius
                      Solved it :-) When sending to unknown users, Postfix now rejects the mail with User unknown in virtual mailbox table , and it does so for hosted (that is,
                      Message 10 of 28 , Apr 6, 2013
                      • 0 Attachment
                        Solved it :-)

                        When sending to unknown users, Postfix now rejects the mail with "User
                        unknown in virtual mailbox table", and it does so for hosted (that is,
                        virtual mailbox domains) domains as well.

                        It seems the SRS-daemon* I have been using with the main.cf parameters
                        recipient_canonical_maps
                        recipient_canonical_classes
                        sender_canonical_maps
                        sender_canonical_classes

                        was the root of the problem. I have just commented them out to solve
                        it. Reading through the documentation for those four parameters, does
                        not seem to indicate why they would mess with Postfix' ability to use
                        virtual_mailbox_maps.

                        But I guess my lack of understanding about Postfix internals is a
                        problem as well. I am sorry for the wasted time, and would like to
                        thank all who helped out.

                        Have a nice weekend


                        * https://github.com/Fruneau/pfixtools
                      Your message has been successfully submitted and would be delivered to recipients shortly.