Marten Lehmann escribió: > I noticed that several large ISPs are denying service (closing an
> SMTP-connection at "connect") if someone is listed in a rbl with the
> code 421 (<domain> Service not available, closing transmission channel),
> while "defer" in an ACL in exim causes 451 to be send (Requested action
> aborted: local error in processing). is there a way to send 421 as 451
> implies that something locally on our side is wrong, which is not the fact?
