How to Configure Postfix and Dovecot with Virtual Domain Users in Linux – Part 2

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Gabriel Cánepa

Gabriel Cánepa is a GNU/Linux sysadmin and web developer from Villa Mercedes, San Luis, Argentina. He works for a worldwide leading consumer product company and takes great pleasure in using FOSS tools to increase productivity in all areas of his daily work.

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85 Responses

  1. Tuboy Thers says:

    Hello Gabriel Cánepa, well done on the tutorial, I managed to follow it through and though I had to tweak a bit to get things going I finally did it and it’s working fine, I can receive messages!

    But I am afraid I cannot send such, sending to other addresses which doesn’t belong to the local host such @gmail.com, @yahoo.com, etc. fails, as if the server is trying to connect them using SMTP.

    Here are few errors which might help you straight what I mean out:

    Sep 28 12:51:40 us00 postfix/smtp[2491]: connect to mx10.mailspamprotection.com[184.154.177.50]:25: Connection timed out
    Sep 28 12:51:40 us00 postfix/smtp[2491]: A25613F0E5: to=, relay=none, delay=227, delays=72/0.03/155/0, dsn=4.4.1, status=deferred (connect to mx10.mailspamprotection.com[184.154.177.50]:25: Connection timed out)

    Sep 28 12:51:35 us00 postfix/smtp[2490]: A42F93F0AC: to=, relay=none, delay=2358, delays=2208/0.02/150/0, dsn=4.4.1, status=deferred (connect to alt4.gmail-smtp-in.l.google.com[74.125.193.27]:25: Connection timed out)
    Sep 28 12:51:35 us00 postfix/smtp[2493]: 1692A3F0D8: to=, relay=none, delay=2278, delays=2128/0.04/150/0, dsn=4.4.1, status=deferred (connect to alt4.gmail-smtp-in.l.google.com[74.125.193.27]:25: Connection timed out)

    Please bare in mind that these two are email addresses hosted externally.

    I have followed all settings in the tutorial, my MX record is pointing to:mx.domain.tld, PTR to mx.domain.tld and mx.domain.tld A Record.

    I am honestly not sure what shall I tweak or do to make sure emails are going back and forth.

    Hopefully you can help!

  2. derek says:

    Centos 7.5, pointing dovecot log file to /var/log/dovecot.log with suggested permissions results with the following error.

    Jul 02 21:03:48 domain.com dovecot[5708]: Can’t open log file /var/log/dovecot.log: Permission denied

    Event chmod 777 /var/log/dovecot.log didn’t help

  3. Vicente says:

    The problem with de line argv=/usr/libexec/dovecot/deliver is the indentation. I have the error message “bad field count” until i put 2 spaces before the argv=.

  4. Le Dang Long says:

    help me! when i go to step

    Before you save changes, add the following lines at the bottom of the file:
    master.cf

    [[email protected] conf.d]# postfix check
    /usr/sbin/postconf: fatal: file /etc/postfix/master.cf: line 129: bad field count

    • Ravi Saive says:

      @Le,

      Go the line 129 in master.cf file and check for any extra spaces or use correct spacing..

      dovecot   unix  -       n       n       -       -       pipe
          flags=DRhu user=vmail:vmail argv=/usr/libexec/dovecot/deliver -f ${sender} -d ${recipient}
      
      • Adem Aksoy says:

        There needs to be space before “flags” (or after pipe). If you are copying and pasting, you need to add it manually.

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

  5. SAJAL says:

    Hello Gabriel A. Cánepa,

    Me too have the same issue, Please comment on this. I have doubt the path “argv=/usr/libexec/dovecot/deliver” in line 134. Is it matching with your tutorial ? Actually that line needs a bit explanation, please consider. thanking you in advance….

    /usr/sbin/postconf: fatal: file /etc/postfix/master.cf: line 134: bad field count
    postfix/postlog: warning: inet_protocols: disabling IPv6 name/address support: Address family not supported by protocol
    postfix/postfix-script: fatal: cannot execute /usr/sbin/postconf!

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