Joseph Brennan wrote:
> Jeff Rife <[EMAIL PROTECTED]> wrote:
>> if ($Sender eq '<>')        # don't greylist here for DSN or callback
>>   {
>>   if ($#Recipients > 1)     # Can't have more than one with null sender

> This is false.

It is false in general, but if you have complete knowledge of all
the types of mail sent from your domain, it may be true.  For example,
I know for a fact that there's no reason for a DSN to be sent to
more than one roaringpenguin.com address.

I agree that for a university, this assumption is likely to be invalid.

Regards,

David.
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