Hi, with standalone cyrus imap server lmtp connections for unknown users were bounced with following error: status=bounced (host xxx said: 550-Mailbox unknown. Either there is no mailbox associated with this 550-name or you do not have authorization to see it. 550 5.1.1 User unknown (in reply to RCPT TO command)) Now we have cyrus murder configuration and those mails are not bounced by frontend server, instead they are queued on postfix server with following error: relay=xxx:24, delay=259650, delays=259650/0.05/0.02/0, dsn=4.4.2, status=deferred (lost connection with xxx while sending MAIL FROM) On frontend server log there is a record about this connection: xxx lmtp[23162]: login: xxx cyrus_user DIGEST-MD5 User logged in xxx master[21353]: service lmtp pid 23162 in BUSY state: terminated abnormally We would like to see that those mails are rejected by frontend like they have been rejected by standalone cyrus imap server. Regards, Vladimir ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html