How should I configure postfix to avoid sent emails bouncing because of "Invalid HELO name"

Posted by Vlad Socaciu on Server Fault See other posts from Server Fault or by Vlad Socaciu
Published on 2011-11-27T15:38:25Z Indexed on 2011/11/27 17:55 UTC
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postfix

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email-bounces

Some mail sent from sites on my server bounce back with the following mail.log message

Nov 26 17:27:53 blogu postfix/smtp[16858]: C4DD22908EC0: to=, relay=rejecting-domain.ro[rejecting-ip]:25, delay=2.5, delays=0.1/0/2.3/0.04, dsn=5.0.0, status=bounced (host rejecting-domain.ro[rejecting-ip] said: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1) (in reply to MAIL FROM command))

On the receiving end, my emails are logged like this:

2011-11-22 15:09:35 H=static.39.80.4.46.clients.your-server.de (Ubuntu-1004-lucid-64-minimal) [my-server-ip] rejected MAIL : Access denied - Invalid HELO name (See RFC2821 4.1.1.1)

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