Bob Proulx wrote:
Sietse van Zanen wrote:
Ralf Hildebrandt wrote:
Kelly Jones wrote:
To fight spam, I want to validate the address (not necessarily in
real-time) of the a given email sender. Is there a Unix tool that
does this?
Postfix has exactly this built in. It's the
"reject_unverified_sender" restriction.
Yes, but you don't always want to reject such mails. NDR's,
automated mails etc are often send from empty or non-existent e-mail
addresses.
Any legitimate email will have a valid sender address. That includes
DSNs and automated messages.
Yes, and that address is, by RFC mandate, empty. An empty (meaning
"<>") address is a valid sender address, and must be accepted.
