• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 262
  • Last Modified:

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.



Featured Post

Get free NFR key for Veeam Availability Suite 9.5

Veeam is happy to provide a free NFR license (1 year, 2 sockets) to all certified IT Pros. The license allows for the non-production use of Veeam Availability Suite v9.5 in your home lab, without any feature limitations. It works for both VMware and Hyper-V environments

Tackle projects and never again get stuck behind a technical roadblock.
Join Now