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Hello 
 
We are kam.co.uk and are running Exchange 2003 servers. Mail goes from our Exchange servers to an SMTP Gateway to the Internet. 
 
One of our suppliers is saying they receive duplicate mails from us. So, if UserA sends RcptA a message, RcptB recieves the message twice. I checked both our Exch logs and SMTP Gateway logs, and we are sending the mail to the Internet only once. 
 
I have asked the Rcpt domain for a the message headers of these duplicate mails, but I had some questions in relation to finding out where the duplication is occuring; 
 
a) The Message-ID on both emails is identical 
b) When looking at the message headers, the timestamps for when they pass through the various MTA's are identical, up until when they are recieved by the Rcpt SMTP Gateway 
 
i.e. 
 
Recieved: from kam.gateway.com by Rcpt.gateway.com at Thurs 22 Jan 01:00 
 
and 
 
Recieved: from kam.gateway.com by Rcpt.gateway.com at Thurs 22 Jan 01:02 
 
Any ideas? 

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Hello

We are kam.co.uk and are running Exchange 2003 servers. Mail goes from our Exchange servers to an SMTP Gateway to the Internet.

One of our suppliers is saying they receive duplicate mails from us. So, if UserA sends RcptA a message, RcptB recieves the message twice. I checked both our Exch logs and SMTP Gateway logs, and we are sending the mail to the Internet only once.

I have asked the Rcpt domain for a the message headers of these duplicate mails, but I had some questions in relation to finding out where the duplication is occuring;

a) The Message-ID on both emails is identical
b) When looking at the message headers, the timestamps for when they pass through the various MTA's are identical, up until when they are recieved by the Rcpt SMTP Gateway

i.e.

Recieved: from kam.gateway.com by Rcpt.gateway.com at Thurs 22 Jan 01:00

and 

Recieved: from kam.gateway.com by Rcpt.gateway.com at Thurs 22 Jan 01:02

Any ideas?


Recipient receiving duplicate emails

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.