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Exchange Server 2003 no longer accepting messages from some sources

I have a windows 2003 enviorment, with Exchange 2003 server. I am not able to recive emails from @hotmail.com or @microsoft.com, and a few others. While I am able to recive email from @gmail.com and @comcast.com.

I finally got this error from my hotmail

Reporting-MTA: dns;bay0-omc3-s1.bay0.hotmail.com
Received-From-MTA: dns;BAY124-W38
Arrival-Date: Tue, 21 Nov 2006 17:48:18 -0800

Final-Recipient: rfc822;USER<User@Mycompany.com>
Action: delayed
Status: 4.4.7
Will-Retry-Until: Thu, 23 Nov 2006 17:49:34 -0800

Another senders tech group sent this:

207.115.xxx.xxx - OutboundConnectionResponse [18/Nov/2006:02:26:44 -0500] "- -?220 mail.rockwellinstitute.com Microsoft ESMTP MAIL Service, Version: 6.0.3790.1830 ready at Fri, 17 Nov 2006 23:26:05 -0800 SMTP" 0 126
207.115.xxx.xxx - OutboundConnectionCommand [18/Nov/2006:02:26:44 -0500] "EHLO -?corp.gmac.com SMTP" 0 4
207.115.xxx.xxx - OutboundConnectionResponse [18/Nov/2006:02:26:44 -0500] "- -?250-mail.MyCompany.com Hello [100.0.0.1] SMTP" 0 48
207.115.xxx.xxx - OutboundConnectionCommand [18/Nov/2006:02:26:44 -0500] "MAIL -?FROM:<wilson@Sender.com> SMTP" 0 4
207.115.xxx.xxx - OutboundConnectionResponse [18/Nov/2006:02:26:44 -0500] "- -?250 2.1.0 wilson@Sender.com....Sender OK SMTP" 0 38
207.115.xxx.xxx - OutboundConnectionCommand [18/Nov/2006:02:26:44 -0500] "RCPT -?TO:<seanw@recepiant.com> SMTP" 0 4
207.115.xxx.xxx - OutboundConnectionResponse [18/Nov/2006:02:26:44 -0500] "- -?250 2.1.5 seanw@recepiant SMTP" 0 39
207.115.xxx.xxx - OutboundConnectionCommand [18/Nov/2006:02:26:44 -0500] "XEXCH50 -?1052 2 SMTP" 0 7
207.115.xxx.xxx - OutboundConnectionResponse [18/Nov/2006:02:26:44 -0500] "- -?500 5.5.1 Unrecognized command SMTP" 0 30
207.115.xxx.xxx - OutboundConnectionCommand [18/Nov/2006:02:26:44 -0500] "BDAT -?4299 LAST SMTP" 0 4

My log files show the files were recievied by the server but then didnt know what todo with them.

I am lost on what could cause this problem, as I have not changed any settings on that server since I installed it a year ago.

mario_andres

Are you using the IMF filter in Exchange ? if so do you quarantine emails that
meet the SPAM criteria ?.

Vahik

turn off XECH50 and see if that would help solve ur problem

http://support.microsoft.com/kb/818222

Vahik

i was going to post this link in my first post

http://support.microsoft.com/kb/895857

but i decided not to ....since ur attachments are being affected only from one domain....Intresting....

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Vahik

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Fittsim

ASKER

Sorry for the delay, but none of those suggestion have helped. I've since found out they use a third party mass mailer, and have abandoned this problem. I have a feeling "resolving" this at this point would put me at a more vulnarable position on stopping incomeing spam.