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224353Asking Open Relay

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  • Marky Yehezkiel
    Aug 1, 2007
    • 0 Attachment

      Dear All,

      Firstly sorry for my bad english,  I have Mailserver and the function as MX, If I test from spamtest via abuse.net my MX can become open relay  and I know if I delete relay_domain it would be work I mean spamtest won’t get through but of course the MX won’t able to deliver email to back-end mailserver. And my main.cf configuration is :

       

      smtpd_helo_restrictions =

                    permit_mynetworks,

                    check_helo_access,

                    hash:/usr/local/etc/postfix/helo_access,

                    reject_non_fqdn_hostname,

                    reject_invalid_hostname,

                    permit

       

      smtpd_sender_restrictions =

         permit_mynetworks,

         hash:/usr/local/etc/postfix/access,

         reject_unknown_sender_domain,

         reject_non_fqdn_sender,

         permit

       

      smtpd_recipient_restrictions =

                      permit_mynetworks,

                      reject_unauth_pipelining,

                      reject_non_fqdn_recipient,

                      reject_unknown_recipient_domain,

                      permit_sasl_authenticated,

                      reject_unauth_destination,

                      check_sender_access hash:/usr/local/etc/postfix/sender_checks,

                      check_client_access hash:/usr/local/etc/postfix/client_checks,

      #                check_relay_domains,

      #               check_policy_service unix:private/policy

                      reject_invalid_hostname,

                      reject_unknown_hostname,

                      reject_non_fqdn_hostname,

                      reject_rbl_client dnsbl.njabl.org,

                      reject_rbl_client sbl.spamhaus.org,

                      reject_rbl_client list.dsbl.org

                      …..

       

      Here is test result from abuse that sent me email :

       

      This is a test of third-party mail relay, generated via the Network Abuse Clearinghouse at http://www.abuse.net.

       

          Target host = ……..

          Test performed by <marky@...> from …..

       

      A well-configured mail server should NOT relay third-party email.

      Otherwise, the server is subject to abuse by vandals and spammers, and probable blacklisting by recipients of the unwanted third-party e-mail.

       

      For information on how to secure a mail server against third-party relay, visit <URL: http://www.mail-abuse.com/support/an_sec3rdparty.html>.

       

       

      Can any one show me maybe one of my configuration is wrong and is it any way how to use MX without relay_domain that caused it become looks like open relay domain. Thank you

       

       

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