Hi Sami,

I have this proxy on pop3/imap working however, I can't get this lmtp to work.

In theory only these configuration changes, should allow messages to be directed for account: test to server svr1 not?

lmtp_proxy = yes

protocol lmtp { # Space separated list of plugins to load (default is global mail_plugins). passdb { driver = passwd-file args = /etc/dovecot/special-passdb default_fields = proxy=y host=svr1 } }

bash-5.0# cat /etc/dovecot/special-passdb test:password:1000:1000:(gecos):home:/bin/false:host=svr1

bash-5.0# cat /tmp/test.msg | /usr/libexec/dovecot/lmtp Info: Connect from local 220 081b883fa2bc Dovecot ready. 250 2.1.0 OK Panic: file connection.c: line 380 (connection_update_properties): assertion failed: (conn->remote_port != 0) Aborted (core dumped)

-----Original Message----- Subject: Re: proxy dual server setup clarification

On 12 Nov 2019, at 16.03, Marc Roos via dovecot <dovecot@dovecot.org> wrote:

I want to migrate mail users to a new environment.

If I setup a new server next to the old server, and enable proxy on both. Is this then enough to migrate user by user with the passdb host=newsvr option to the new environment?

Eg. I do not need to configure a director setup? I only need to enable proxy for imap and lmtp on both servers? (messages on the oldsvr will be proxied to the newsvr?)

You need just one proxy where the user session is authenticated and then forwarded to either backend depending on the host value. You don't need to "enable proxy" on any backend or use director.

Sami