You need a PTR record for reverse lookup that will resolve the ipaddress of the sending MTA to it's hostname.
Ev At 16:55 29.10.2003, Michael Bouchard wrote:
I am attempting to send email through the courier esmtp server, to a server hosted with Verio. I have historically had no issue sending mail to this recipient, but in the past week, my mail to this recipient bounces back to me with something like the following: UNDELIVERABLE MAIL
Your message to the following recipients cannot be delivered:
<[EMAIL PROTECTED]>: mail-fwd.xxxxxx-verio.com [xxx.xxx.xxx.xx]: <<< 554 <xxx.xxx.xxx.xx>: Connection rejected: reverse DNS lookup failed
Is this something that I can correct at my server, or does the issue need to be corrected at Verio's end? I am having no problems with other recipients, so my instincts tell me that it might not be my problem.
I long ago added the -noidentlookup and -nodnslookup options to TCPDOPTS in esmtpd to eliminate long timeout delays that we were getting when sending mail from one of our offices (they are behind a NAT router). Is the -nodnslookup relevant to this error? I thought it was a dnslookup on a host sending mail through the server, not something initiated by a receiving host...
Also, I am told that verio just added some new spam filtering technology to their mail servers - this problem seems coincide with the time-frame of their change...
Any help is greatly appreciated!
--Mike Bouchard
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