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Nigel Metheringham edited this page Nov 29, 2012 · 2 revisions

Q0005

Question

Why is Exim not rejecting incoming messages addressed to non-existent users at SMTP time?

Answer

This is controlled by the ACL that is run for each incoming RCPT command. It is defined by the acl_smtp_rcpt option. You can check this part of your configuration by using the -bh option to run a simulated SMTP session, during which Exim will tell you what things it is checking.