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I've come across an issue with MS SMTP handing off to IMail that I
believe needs to be looked into. Essentially, about once a minute, MS
SMTP logs an error in my Event Log as follows: Message delivery to the remote domain 'customerdomain.com' failed for the following reason: The remote server did not respond to a connection attempt. MS SMTP and IMail are on the same box where this occurring, but my backup gateway which is MS SMTP also and is located on a different network, rarely shows this error. My primary server is nowhere near to capacity at this point, but these errors do increase evenly with the ebb and flow of traffic. In other words, it seems like the failure rate is completely even regardless of traffic and not impacted by load. This suggests to me that there may be an issue with the TCP connections internal to this box. This could also be an indication of another famously inaccurate Windows error which could be misreporting the issue at hand. I have IMail set to the maximum number of threads, 20, and I don't believe that this should be at issue on my current volume. In my research, I have found that these errors are logged almost exactly one minute before IMail is seen accepting the E-mail. I have MS SMTP set to timeout on outgoing connections after 1 minute, so this could be the result of an initial failed connection. Here's an example showing the MS SMTP log when the E-mail is initially accepted (just prior to the error) , then the error in Event Viewer, and then the IMail log showing the message being accepted just one minute after the error: MS SMTP Log Does anyone have any ideas where to look for resolving this? Because the backup gateway has very few issues, I'm suspecting that somehow MS SMTP is responsible for the failed connections, or at least, there is no indication of these connections being attempted in IMail when the error is logged. My hourly processor utilization averages are between 10% and 25% depending on the time of day. About 0.5% of the connections are failing and logging this error in Event Viewer. Thanks, Matt -- ===================================================== MailPure custom filters for Declude JunkMail Pro. http://www.mailpure.com/software/ ===================================================== |
