On 19-Jan-07, at 4:59 PM, Michael Holzt wrote:
I was thinking of rejecting mail when the MAIL FROM is empty or
set to
<> during the MAIL FROM stage.
Do not. "<>" is the legitimate envelope sender for bounce messages and
shall never be blocked. Unfortunately this can be abused by spammers,
but it is nevertheless harmfull to block "<>".
Nonsense. I block all mail from <> and have done for 2 years (maybe
more). There's no harm been done, and for my little domain with 2
users I'm blocking up to 30k emails a day that way.
