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How do you prove external email servers not working?

V

VinylxScratches

Golden Member
There has been an influx of delivery delays and NDR emails.

I have checked logs and I see 30+ attempts to push this message to the external email servers case by case.

I do tests like send emails w/o attachments and the end server gets it. I send some attachments and they fail. I tell the end user it's not our issue and that they're denying us. Then I get a reply from the other end claiming they don't see any action on their end which is simply not true when I see an email travel to their mx1 server, then get queued again to go to mx2. etc....

Any tips???
 
The NDR should include the reporting server name, delays are more difficult because that could just be bandwidth, DNS, etc issues. If you're talking about Exchange it's even worse because it's logs are shit to deal with. If you're using Postfix, Sendmail, etc then the logs should clearly say what the mail was delayed.
 
It's Exchange 2003... I'd have to check but it was 4.4.7... which I recall is it kept attempting to do what it needs to do but the end server refused it and it timed out.
 
Ok, I just had a thought. I had a ticket with one user that got some delays NDRs... when I did the log, there were over 50 email addresses he sent to spanning from private domain companies to SBC to covad.net etc.... do you think this might have spiked us as SPAM?
 
VinylxScratches said:
Ok, I just had a thought. I had a ticket with one user that got some delays NDRs... when I did the log, there were over 50 email addresses he sent to spanning from private domain companies to SBC to covad.net etc.... do you think this might have spiked us as SPAM?
Click to expand...

It's entirely possible. Check http://www.mxtoolbox.com/ .

Also, consider that some mail servers have a limit on the number of recipients can be in a message before they reject it. It doesn't matter if all the recipients are to that domain or not, it'll still be rejected.
 
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