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295007Re: Disabling user submission on port 25

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  • Stan Hoeppner
    Aug 27, 2013
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      On 8/26/2013 10:24 PM, John Allen wrote:

      > I based it something that Noel Jones wrote way back in 2008.

      I doubt that Noel suggested anything like this.

      > Create a file of the networks you wish to deny access to eg.
      > “Deny_Mynetworks_Access” the content of which will be the same networks
      > as those found in the mynetworks parameter of the main.cf file for example:
      >
      > 192.168.0.0/16 REJECT local access not permitted
      > n.n.n.n/28 REJECT local access not permitted
      > [nnnn:nnnn:nnnn::]/64 REJECT local access not permitted
      >
      > remove the permit_mynetworks from all the various
      > smtpd_xxxx_restrictions stanzas of main.cf. Then modify the master.cf by
      > adding
      > -o smtpd_client_restrictions=hash:Deny_Mynetworks_Access,.....
      > to the smtp service, and add
      > -o smtpd_client_restrictions=permit_mynetworks,.....
      > to the submission service.

      This unnecessary and complex and actually won't work as stated. All
      that is required is a one line change to master.cf and a CIDR file:

      /etc/postfix/master.cf
      ...
      smtp inet n - - - 20 smtpd
      -o smtpd_client_restrictions=check_client_access,\
      cidr:/etc/postfix/deny-local.cidr

      /etc/postfix/deny-local.cidr
      192.168.0.0/16 REJECT local access not permitted


      Aug 27 01:28:21 greer postfix/smtpd[31670]: NOQUEUE: reject: RCPT from
      gffx.hardwarefreak.com[192.168.100.53]: 554 5.7.1
      <gffx.hardwarefreak.com[192.168.100.53]>: Client host rejected: local
      access not permitted; from=<stan@...> to=<xxxx@...>
      proto=ESMTP helo=<[192.168.100.53]>


      --
      Stan
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