They are attempting to block SPAM by accepting only mail from hosts where
the string in the HELO can be resolved to an IP address, and possibly also
checking that a reverse DNS lookup on the IP address of your end of the SMTP
conversation matches the HELO string.
If they are smart, they will realize that this will reject valid mail from
lots of people because of firewalls and address translation, and will stop
doing it. If they are dumb, they will still stop, but it'll just take
longer...
In the short term, create an A record in your public DNS for whatever IMS
servers (or whatever talks SMTP to the Internet).
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, September 19, 2001 3:58 AM
To: Exchange Discussions
Subject: Message REJECTED due to incorrect configuration
hi all!
i have one exchange server 5.5 with sp5. this server connects to a mail
relay where webshield smtp is installed and where all mail from/to the
outside world comes/goes.
today i received a message from other mail server (external) like this:
"Message REJECTED due to incorrect configuration of YOUR mail server. Your
mail server is incorrectly configured and this has caused your mail to be
rejected. Reject Reason: HELO greeting is incorrect: 504 need
fully-qualified hostname. The name which your mail server uses to identify
itself is NOT a Fully Qualified Domain Name (FQDN) resolvable by the DNS
and thus we have rejected your message. To ensure that mail sent to our
mail server arrives correctly please ensure your configuration is
correct."
this never happened before (at least, i have no knowledge of anything
similar ever happened) and nothing was changed in the config of the
exchange server or the mail relay.
ok... my question is: where do i configure this? can someone help?
thanks a lot
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