> I've been using, until now, the security configuration "Refuse NULL
> <> Senders". To be honest, I never knew exactly why. Anyway, I was
> contacted by another ISP that tells me that, by doing so, I'm not
> complying to RFC-821, since intentionally bounced e-mails are being
> refused.
They are correct. Ipswitch put that in there because of customers requesting it, and
has it turned off by default. But, they forgot to put in a warning that it is a truly
bad thing to do!
Some spammers will use "<>" (a null sender) in the message envelope (as opposed to the
message headers). However, the RFCs specifically state that you MUST accept mail from
"<>". And, there's a good reason: E-mail that is returned is supposed to use "<>".
> If so, what is the purpose of this setting?
The purpose of the setting was truly to satisfy some customers that must have begged
for it. Probably, because they thought it would help with spam.
-Scott
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