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Outlook Multiple message

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by simon

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Hi all, I have just move over to Outlook 98 as our internal and external email client, using Exchange. This went well, but now I have a problem with emails being received up to 4 times (the same one).

It's not happening to everyone just one user (The MD, such is life), he gets certain emails from certain people 4 times (the same message 4 times?).

I sent a message from Yahoo and from Hotmail to him to see if the same would happen, but they only came once?

Does anyone have any ideas, he is the only one to have reported the problem.

Setup Client is Win98, Outlook 98 (TCP/IP only)
Server is Win2k Server, Exchange 5.5.

Thanks.

Simon

5 replies

by oldefar

The SMTP string for receiving messages goes like this:

HELO mail.domain1.com
250 OK
MAIL From:
250 OK - mail from
RCPT To:
250 OK - Recipient
DATA
354 Send data. End with CRLF.CRLF
221 closing connection

If the 354 response gets fragmented then the sending server assumes the message was not completed successfully and will send it again.

This was a common problem with older versions of Cisco PIX firewalls running Mailguard. If this is your situation, try turning Mailguard off or updating your firewall software.

The problem may also be at the sending domain end (most likely when all duplicates are from a specific domain) or at any of the relay points. You can check headers to find common points in the path.

by oldefar

Turn on SMTP Protocol Logging and view the SMTP log to see the above exchange. You will probably find that the 221 message is not being received.

by simon

I don't have a PIX fire wall (thank goodness, just threw it away and got a Netpilot instead, Thank you for the info on Events, I will have a look.

by rindi1

Hi, if the mail account lies on an external server and your client has set up more than one PCs with access to that external account, and the settings in the account are setup so that the messages aren't removed from the server once downloaded, all the PCs will download that message separately and leave a copy of it on your exchange server. If you uncheck the "leave a copy of messages on server", your client should only receive that message once, as long as he isn't logged in to the server on more than one machine at once.

by simon

I don't have POP3 mail on each computer, the Exchange server picks up the mail through the Netpilot and as far as I can see there is no option for leave mail on server (although I understand your thinking). Then the mail gets sent around the building through Outlook 98 (using Exchange).

Thank you for your ideas.

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