I am using Posfix with virtual mailboxes. Dovecot hosts these mailboxes and Posfix delivers mails via the LMTP delivery agent to Dovecot.
I am looking for an option to temporarily pause delivery via LMTP and defer mail while the Dovecot mailboxes are being backed-up in order to get an consistent state. After the backup has been completed, I want to re-enable mail delivery. Delivery via the LMTP delivery agent shall be paused independently from how the mail got into Postfix. This means, even if a mail has been picked up locally (from sendmail) and the mail's destination is a virtual mailbox, the mail shall be deferred. At the same time, mails which are supposed to be sent off the machine shall still be delivered via the SMTP delivery agent normally. What is the best way to configure that behavior? In the following, I'll present my approach as far as I got. According to my understanding of the Postfix architecture the correct place to do that is after the incoming queue. (Most solutions from the Internet tinker with the configuration of the SMTPD, but this does not suit my objectives.) I assume that the better solution is to use the `transport_maps` and to override the LMTP delivery agent with the ERROR delivery agent for the virtual mailbox delivery. My current configuration is ``` virtual_mailbox_domains = my-domain.de virtual_transport = lmtp:unix:private/dovecot-lmtp virtual_mailbox_maps = proxy:ldap:/etc/postfix/ldap/virtual-mailboxes.cf virtual_alias_maps = proxy:ldap:/etc/postfix/ldap/virtual-aliases.cf ``` I am planning to use ``` transport_maps = hash:/etc/postfix/transport ``` with `/etc/postfix/transport` something like ``` my-domain error:4.2.1 Mailbox read-only, not accepting messages ``` At the beginning of the backup process, the backup program would write the line into `/etc/postfix/transport` and remove that line after the backup has been completed. Is that approach possible? Better ideas? Specific questions: - I would like to encode the status code 4.2.1 acc. to RFC 3463 Sec. 3.3 into the error response. Is the shown syntax of `/etc/postfix/transport` correct? - Which Postfix daemon uses `transport_maps` and how fast does the daemon pick-up changes to the map? Do I need a `postfix reload` or is `postmap /etc/postfix/transport` enough? - Does Postfix keep the mails in it own deferred queue and delivers the deferred mail later or does Postfix bounce the mail back to the original sender? Bests and thank you for any help in advance, Matthias -- Matthias Nagel Dachtlerstr. 2, 40499 Stuttgart Festnetz: +49-711-25295180, Mobil: +49-151-15998774 E-Mail: matthias.h.na...@posteo.de, Skype: nagmat84, Threema: 86VM8KN7 _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
