LMTP should reject unknown lists in RCPT-stage
Original LP Author: Bernhard Schmidt , LP Link: https://bugs.launchpad.net/bugs/982555
At the moment the LMTP runner rejects mails to non-existing lists after the DATA stage.
telnet localhost 8024
Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 mail.svr02.mucip.net Python LMTP runner 1.0 MAIL FROM: berni@birkenwald.de 250 Ok RCPT TO: thislistdoesnotexist@birkenwald.de 250 Ok DATA 354 End data with . Message-ID: bal@blubb.de
as . 550 Requested action not taken: mailbox unavailable
It should reject invalid addresses in the RCPT TO stage, this way it could easily be used with Postfix' feature "reject_unverified_recipient" to avoid accepting and then bouncing messages.