No.Wont the <> sender open relay up for spammers?
You've got to accept mail from "<>", it's that simple. :)
Rejecting the mail means you won't get bounce messages, you'll annoy other postmasters with "double bounces", and you'll get listed at http://www.rfc-ignorant.org .
The *only* advantage to spammers is that by sending mail from "<>", it will prevent you from blocking their return address. However, not much spam is sent this way, and other spam blocking methods tend to be much more useful (blocking on "<>" on a typically system would have about a 50% false-positive ratio, meaning that 1/2 the E-mail it catches would be legitimate mail!).
-Scott
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