On Thu, Jan 05, 2023 at 05:38:49PM +0100, Gerben Wierda wrote:
> I am setting up a new server combination (postfix + dovecot). dovecot's auth
> service works for postfix. Just lmtp does not and I need to find out why. I
> don't see anything in the dovecot logging, but I see this on the postfix side
> (debug)
>
> Jan 05 16:11:59 snape postfix/lmtp[127]: connection established
> Jan 05 16:11:59 snape postfix/lmtp[127]: master_notify: status 0
> Jan 05 16:11:59 snape postfix/lmtp[127]: deliver_request_initial: send
> initial response
> Jan 05 16:11:59 snape postfix/lmtp[127]: send attr protocol =
> delivery_request_protocol
> Jan 05 16:16:59 snape postfix/lmtp[126]: smtp_get: timeout
The LMTP server did not respond with a 220 banner, and after 300s the
Postfix lmtp delivery agent gave up.
> Jan 05 16:16:59 snape postfix/lmtp[126]: send attr reason = conversation with
> snape.rna.nl[private/lmtp] timed out while receiving the initial server
> greeting
> It seems dovecot doesn't react to whatever postfix is doing on the
> socket. Another possibility is that the socket doesn't really work and
> dovecot never gets a connection request. How can I debug this?
>
> Might I test if the socket is the problem by running lmtp on the
> dovecot side on TCP on 127.0.0.1 and have postfix use that? Just to
> see if it works? If so, how do I tell postfix to do that? In dovecot I
> have added the tcp:
>
> service lmtp {
> inet_listener lmtp {
> address = 127.0.0.1
> port = 24
> }
This is fine.
> unix_listener /var/spool/postfix/private/lmtp {
> mode = 0660
> user = postfix
> group = postfix
> }
DO NOT do this! That socket is for the listen side of the qmgr<->lmtp
communication. The Dovecot LMTP socket needs to be outside the
Postfix-private namespace.
--
Viktor.
