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Exchange - Outlook - Spoof Email

I have Exch 2003 on Win2003 sp2, and outlook as client sp3. and AD on Win2003 sp2 on separated server. I have a Mailbox shared for Accounting called "AP@domain.com" , We have a spam filter which send a report 2 times a day. One of the Accounting users get the report, and show sender from: AP@domain.com to: AP@domain.com. The user deliver the mail and whitlelisted becuase he thougth was and emails send in our local network. However when he recieved the email on the inbox. A weird name (which is not in our organization) appears for example Emilio Mata AP@domain.com. My question is how possible is that this strange name appears on our AP@domain.com ???? we have a good Email filter (Barracudas), and i do not know how these people were able tranpass this.
Can you please let me know what is the best method to avoid this issue?
Thanks a lot,
1 Solution
Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
You can use IMF builtin Exchange 2003 SP2.

Go to ESM -> Global Settings -> Message Delivery (properties) -> Recipient Filtering tab
Check the bottom box that says filter recipientsthat are not listed in AD.

That would mean that spammers will know email addresses are genuine in a directory harvest attack. Use SMTP Tarpitting to prevent this.


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