The System i is our mail server. We have a particular domain
(msdsc.org) we cannot email to. We get (after a good hour or so) the
NOT ABLE TO DELIVER MAIL TO SOME/ALL RECIPIENTS.
REPLY CODES WITH FIRST DIGIT = '4' OR '5' ARE ERROR REPLIES.
ERRORS THAT DO NOT HAVE ERROR REPLY CODES MAY EXIST.
HOST I5 NOT ABLE TO DELIVER MAIL TO FOLLOWING RECIPIENT(S):
RETRIES EXHAUSTED WHILE ATTEMPTING TO CONNECT TO REMOTE HOST msdsc.
** TEXT OF MAIL FOLLOWS **
Received: from [192.168.0.35]([192.168.0.35])
by I5.DILGARDFOODS.COM (IBM i5/OS SMTP V05R04M00) with TCP;
Thu, 28 Feb 2008 14:07:56 -0500
Date: Thu, 28 Feb 2008 14:07:55 -0500
From: Jeff Crosby <xxxxx@xxxxxxxxxxxxxxxx>
User-Agent: Thunderbird 188.8.131.52 (Windows/20080213)
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
The tech guy at msdsc.org says it's a reverse DNS issue. I got our
Network Guy in (who does not understand System i) and he determined the
System i was not properly identifying itself. He determined that from
the following PC session:
554 Connection refused: Connecting client IP doesn't match the host it
claimed to be
during HELO. Failed to find any correlation between the claimed host
(i5.dilgardfoods.com) and the connecting IP (63.xxx.xxx.xxx).
I ass-u-me this is because the System i is identifying itself as
i5.dilgardfoods.com which is not valid outside our LAN. As a mail
server, it is known in the world as mail.dilgardfoods.com. Is the
answer that the System i smtp server must somehow identify itself as
mail.dilgardfoods.com? If so, I could not find anywhere in CHGSMTPA or
iNav where this could be done. In CFGTCP I have both
i5.dilgardfoods.com and mail.dilgardfoods.com under 192.168.0.1.
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