This is where SPF comes in very handy:

http://spf.pobox.com/

Tom
----- Original Message ----- 
From: "Scott Smith" <[EMAIL PROTECTED]>
To: "Imail Forum" <[email protected]>
Sent: Monday, June 20, 2005 8:55 AM
Subject: [IMail Forum] Block messages that claim to come from my domain


| Is there a way to block all messages that are "from" my domain but are not
| valid accounts or aliases setup in my domain?  We've been getting a lot of
| infected zip files lately that are claiming to come from email addresses
| that don't exist in our domain.  I realize that I can just explicitly 
block
| those that I've identified, but I want to know if there's a way to block
| future ones as well without explicitly knowing what they are.
|
| Thanks,
|
| Scott Smith
| Network Administrator
| 248.489.1999
| [EMAIL PROTECTED]
|
| Westside & Detroit Reprographics
| An ARC Company
| ------------------------------------------------- 
|
|
|
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