Autor: Roger Burton West Data: Dla: exim-users Temat: [exim] Telling a secondary MX about valid addresses on the primary
This is probably really obvious...
I have two MX machines, call them mx0 and mx1; mx0 is the lower-priority
and does deliveries to users. As is the way of the world, mx1 gets hit
by a lot of spammers with scraped addresses which will be undeliverable
(e.g. message-IDs). At the moment, mx1 accepts the message (assuming it
passes the spam filter), and forwards it to mx0, which rejects it; then
mx1 tries to send a bounce message to the (faked) originator.
Is there a way of letting mx1 know what addresses on mx0 are valid, so
that it can refuse the message while the SMTP session is still live?
