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288585Re: MTA Deferring e-mail

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  • Reindl Harald
    Oct 2, 2012
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      Am 02.10.2012 02:56, schrieb Jason T. Slack-Moehrle:
      >>> So it looks like incoming e-mail might be working now, outgoing
      >>> not so much.
      >>
      >>> Oct 1 16:34:03 www postfix/smtp[3362]: connect to
      >>> gmail.com[74.125.224.149]:25: Connection timed out
      >>
      >> This looks quite like a "disable_dns_lookups=yes" issue. The question
      >> then would be: how was it working before?
      >
      > $ postconf -n
      > disable_dns_lookups = yes
      >
      > I now changed it to 'no' and things seem to be working again.
      >
      > I dont understand why, though, this would be creating the problem.
      > Could you explain?

      see docs: http://www.postfix.org/postconf.5.html#disable_dns_lookups

      disable_dns_lookups (default: no)

      > If it creates this problem, why do people set it?

      nobody does set it global

      it makes sense on internal transports like LMTP in
      master.cf but NOT as global setting!

      dbmail-lmtp unix - - n - - lmtp -o disable_dns_lookups=yes -o max_use=100
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