One of our User ( Well, it happened to be our CFO ) is getting too many Undeliverable messages from outside, eventhough he didnt send any emails to such domains,
Someone is using his ID to send so many messages to all over the world , and the return mails ( undeliverables ) coming back to our Mail server and then his Mailbox.
I checked our LAN , I couldnt find anything suspicious.
Mine is Exchanve 2003 environment with Symantec Mailsecurity for incoming / outgoing messages.
Exchange forward all outgoing emails to SYMA MS and all incoming mails are routed to Exchange through Syma MS.
How can I prevent this ?
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