No IP address found for HELO smtp.conn, try again later

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guido331
Posts: 11
Joined: Tue Jul 26, 2005 3:44 pm

No IP address found for HELO smtp.conn, try again later

Post by guido331 »

I see lots of messages getting rejected for one of my domains (secondary MX) with the following information:

"No IP address found for HELO smtp.conn, try again later"

What does that mean?
Seth
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Location: Nevada
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Re: No IP address found for HELO smtp.conn, try again later

Post by Seth »

That message is from one of the client validity checks:

https://acc.rollernet.us/help/mail/client.php

Specifically, the "HELO must resolve to client IP" test, which is a stricter form of the "HELO must resolve to any IP" test. The message means the client sent a HELO/EHLO that did not resolve even though RFC 5321 section 2.3.5 states that it MUST be a primary host name, i.e. resolvable.
Seth Mattinen, Roller Network LLC
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