Is there a way I can stop spam from sending to myself, from myself?

I have noticed there has been a lot of spam mail coming from an account in our office and I just recently received an email from myself that was spam.  Is there a way to stop this?  I already have GFI Mail Essentials, which should be taking care of this, but I guess it isn't 100%.  Any ideas on what I could do to stop this?
Jscott82305Asked:
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grbladesCommented:
Implement SPF (or Sender ID) and add a SPF/SenderID record to your DNS. Then only email coming from your domain from approved IP addresses will be accepted. Any other forged email will be rejected.
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kieran_bCommented:
SPF is not going to be the solution - if you implement it to drop anything incorrect, you will lose mail.

Configure GFI so that it drops incoming mail pretending to be from @yourdomain

As long as you don't have external users using POP3, you will be fine.

Kieran
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Michael WorshamStaff Infrastructure ArchitectCommented:
On the Exchange server, you can also setup an RBL check to keep the spam down as well.
http://www.petri.co.il/block_spam_with_exchange_2003.htm
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Jscott82305Author Commented:
Kieran,
How can I configure GFI to do this?
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kieran_bCommented:
Add your domain to the blacklist;

http://www.gfi.com/mes/me11manual.pdf (page 71)

If GFI gets upset about that (which it might, last version I used was 10) you can do this from Exchange itself;

http://www.msexchange.org/tutorials/Sender-Recipient-Filtering.html

You want to block *@yourdomain.com
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Jscott82305Author Commented:
Thanks for your fast help!
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