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295437Re: Can't send mails but I can receive

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  • Wietse Venema
    Sep 12, 2013
      Jan P. Kessler:
      > > > Sep 12 04:57:06 nudin1 postfix/smtp[29110]: connect to
      > > > freenet.de[62.104.23.42]:25: Connection refused
      > >
      > > connection refused is a network problem, probably a firewall block.
      > > Perhaps your ISP doesn't allow you to run a mail server?
      >
      > Something is wrong with your DNS resolution. freenet.de[62.104.23.42] is
      > not the correct MX for @...:

      Well spotted. Apparently he uses A lookup instead of MX lookup.
      This is a definite no-no for email.

      % dig a freenet.de
      ...
      freenet.de. 300 IN A 62.104.23.42

      Wietse
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