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Joemt

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email from 1 sender not making it past failed mail folder

Heres the situation

Server running 2003 SBS with exchange SBS. they are getting thier email from an outside source and POP3'ing it via exchange.
They can send, and recieve email. one sender from the outside world cannot get through though to any of the clients. all the email they send ends up in the Failed Mail folder.
when i check the event log i get: event ID 1019 Source: POP3connector
which i have researched to not much fruition. i've read some troubleshooting that suggests this has to do with mismatched MTU's. since when i perform "ping -f -I 1472 <popserver>" i get a reply of "packet needs to be fragmented but DF set". not sure exactly what the issue is.
Any comments helpful to get to the bottom of this.
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Forefront_Data_Solutions
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Take a look at this Microsoft article.  I believe that you are on the right track by looking at mismatched MTU's.  This article tells you how to troubleshoot and correct the issue.

http://support.microsoft.com/default.aspx?scid=kb;EN-US;314825
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Joemt

ASKER

Forefront data:
thank you for your reply!
I think it may be the MTU issue aswell, but before i proceed with the fixes i have a few other observations to discuss.
In the failed mail folder, when i view these emails, it says FROM: unspecified sender
which i think is a little odd.
Also, the emailer is using a BCC program to send out these emails, they are invoices and he is emailing many different people at the same time. which i have read in 2003 SBS email from BCC's will automatically go into the failed mail folder. i am having the emailer email me directly using the exact same system he uses to email my client.  i want to exaust all possibilities before i go in and start modifying the registry.
any thoughts?
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Forefront_Data_Solutions
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Turns out it was a BCC issue. thanks for the assist!

http://support.microsoft.com/?id=265739

heres the link from microsoft.