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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: SMTP no-such-user issues
Please share a packet capture of a working and not working SMTP exchange. Frank -----Original Message----- From: Steve Bertrand [mailto:[email protected]] Sent: Tuesday, June 17, 2008 6:14 AM To: [email protected] Subject: Re: SMTP no-such-user issues Steve Bertrand wrote: > Hi everyone, > > We are experiencing an issue in regards to SMTP MTA relay responses > regarding 'no such user', and it *apparently* appears to be only > occurring when a particular site attempts to deliver email to us. Any > advice on how to further troubleshoot my issue would be greatly > appreciated. Because I have been inundated with off-list replies, I'll post my findings here. First, a screen cap of me composing a message, in which two of the addresses are easily identified as valid, and two are clearly not: http://ibctech.ca/nanog_smtp/hotmail_compose.jpg ...when I sent it, I received thus: http://ibctech.ca/nanog_smtp/hotmail_response.txt So, we'll try it from a different server: http://ibctech.ca/nanog_smtp/local_compose.jpg ...hmmm, I received the message at [email protected] (even though the To: field was cropped out of the jpg) this time, and my server generated the following....AFAICT, correct 551 error(s): http://ibctech.ca/nanog_smtp/local_err.txt I'm willing to provide any more documentation required in order to get this issue sorted. Thank you everyone, I truly appreciate it. Steve
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