On Tue, Oct 14, 2014 at 10:48:38AM -0400, Tanstaafl wrote: > Rejecting will actually *reduce* traffic, because it doesn't accept the > entire messages, it slams the door at the RCPT-TO stage. Rejection can happen after the DATA phase as well. It's better if spam can be identified and rejected before this phase, for the reasons you have identified; but it isn't always possible.