[SpamCop-List] Re: my domain being used in return address

[Jim Seymour]

Benno wrote:
> The solution i made was configuring the mail server to reject al connections
> in the following situations.
> 
> mail from: <>
> rcpt to: <nonexsitend at mydomain.com>
> 
> To resond "550 No such user here"

Of course, I'm of the belief that mail servers should reject *any* 
delivery attempt to a non-existant user with a 55X error.

Sadly, many (*cough* Microsoft *cough*) mail servers don't allow this 
easily(*).  Instead, they generate a new message and send it to the 
address on the From: line.

(*) I know that Exchange 5.5 CANNOT do this.  Does anybody have 
experience with Exchange 2000+?  Can they reject an unknown recipient 
during the SMTP dialog?

-- 
Jim Seymour.
I do not work for Spamcop, I did not write pflogsumm,
and I never wrote for PC Magazine.