Re: SMTP error the remote server did not respond to a connection attem
- From: "Sanford Whiteman" <swhitemanlistens-software@xxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 05 Jun 2008 18:52:54 -0400
We have a SMTP Service setup in IIS 6.0 for sending mail from a
website. This service will randomly have an error that says "Message
delivery to the host <ip> failed while delivering to the remote
domain <domain name> for the following reason: The remote server did
not respond to a connection attempt"
It's almost certainly not "random" -- nothing in SMTP really is. A
major difficulty in supporting mailservers is that must know not only
the RFC (standard) failure points for DNS and SMTP, but you must learn
to intuit the use of non-standard anti-spam/anti-abuse "best
practices" that can be equally disruptive to mail delivery. The
permutations are staggering -- though not unlimited.
First off, consult your logs. The Event Viewer summary events are
hardly sufficient for diagnosing delivery problems.
Next, download MS' SMTPDIAG tool and run it, from the mailserver, for
the exact sender and recipient in question.
Third, does your mailserver pass the PTR-EHLO-A roundtrip check? Check
the archives of this list for my many posts on this.
--Sandy
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Sanford Whiteman, Chief Technologist
Broadleaf Systems, a division of
Cypress Integrated Systems, Inc.
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