Hi list, I recently completed my first OpenSMTPD-based mail setup and in general, things seem to work very well. Testing some edge cases, however, I ran into something I cannot understand.
In the event that the local delivery fails with a 5xx error, OpenSMTPD queues the message for retry (and eventually supplies the sender with a "delayed" delivery notification, etc). My naive expectation is that SMTP 5xx means permanent failure, so an immediate bounce would be more appropriate. I can provoke this on two occasions: 1. User does not exist: Apr 8 08:03:45 mail smtpd[26476]: 5d56b355f19e7a92 mda delivery evpid=9d6aa2bcd0d53c97 from=<t...@example.com> to=<nosuchaddr...@example.com> rcpt=<nosuchaddr...@example.com> user=vmail delay=10s result=TempFail stat=Error (temporary failure: "mail.lmtp: LMTP server error: 550 5.1.1 <nosuchaddr...@example.com> User doesn't exist: nosuchaddr...@example.com") 2. User quota is full: Apr 8 07:45:39 mail smtpd[1517]: 65b4cb1b1ad15fa4 mda delivery evpid=3a1e3c3302257a66 from=<t...@example.com> to=<iamf...@example.com> rcpt=<iamf...@example.com> user=vmail delay=10s result=TempFail stat=Error (temporary failure: "mail.lmtp: LMTP server error: 552 5.2.2 <t...@example.com> Quota exceeded (mailbox for user is full)") In both the above occasions, I would prefer if OpenSMTPD bounced the incoming email immediately, instead of spending resources on queueing and retrying it. Why is the 5xx from LMTP treated as a TempFail? Can this be changed somehow? My setup is pretty basic and does not deviate much from the one published in the excellent "Setting up a mail server with OpenSMTPD, Dovecot and Rspamd" by Gilles. I mostly added stuff on the Dovecot/Rspamd side only (virtual users, quotas, sieve, etc). Local delivery is handed over to Dovecot via: action "domain_mail" lmtp "/var/dovecot/lmtp" rcpt-to virtual <virtuals> I cannot see anything related in the configuration (I assume it must be OpenSMTPD since Dovecot answers with a correct 5xx code). I went through the man page a couple times and searched the web, but I haven't found anything related. This is OpenSMTPD 6.7.0 on OpenBSD 6.8 (+syspatch). Any insight would be highly appreciated! Many thanks, Tom
