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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