Zimbra Postfix Problem

Discussion in 'Server Operation' started by XNM13, Apr 11, 2016.

  1. XNM13

    XNM13 New Member

    Hi, first apologize me for the grammar, english isn't my native language.
    The problem I have is users from our local zimbra mail are getting spam messages from other email addresses who don't exist, like annymous172167@ourdomain

    I found that the problem can be OpenRelay in postfix configuration.
    I did this test tech-recipes /send_mail_via_telnet_test_for_open_relay/ (link edited because I cant post links) and foud that I can send emails via telnet without any authentication.
    To resolve the problem, I tried to change the postfix configuration.
    My original conf file (/opt/zimbra/postfix- was
    "smtpd_sender_restrictions = check_sender_access regexp:/opt/zimbra/postfix/conf/tag_as_originating.re, permit_mynetworks, permit_sasl_authenticated, permit_tls_clientcerts, check_sender_access regexp:/opt/zimbra/postfix/conf/tag_as_foreign.re, check_sender_access hash:/opt/zimbra/postfix/conf/access_table"
    And I tried to change to
    "smtpd_sender_restrictions = reject_unknown_sender_domain"
    But when I run "$postfix reload" the configuration come back to the original one, without any changes.
    (I found that configuration change on this forum "How to disable open relay on Postfix?")

    I appreciate any help. Thank you :)
  2. XNM13

    XNM13 New Member

    I found the solution, thank you all!
    jorgedelacruz(.)es/2014/04/03/zimbra-seguridad-i-parte/ (in spanish)

Share This Page