[Dovecot] POP/IMAP on proxy rip issue

Urban Loesch bind at enas.net
Mon Feb 27 17:52:05 EET 2012

Same here on 2.0.x.
But I think this is because it's only implemented for IMAP.

See e-mail from Timo 2 days ago:


Subject: Proxying improvements in v2.1.2

I just committed a couple of features that will make life easier for some types of proxying setups:

1. IMAP proxying has already for a while supported sending local/remote IP/port to backend server, which can use it for logging and other purposes. 
I've now implemented this for POP3 as well, although only the remote IP/port is forwarded, not local IP/port. I implemented this also for LMTP in v2.2 
tree, but haven't bothered to backport that change. Both POP3 and LMTP uses XCLIENT command that is compatible to Postfix's (XCLIENT ADDR= 

2. proxy_maybe=yes + host=host.example.com actually works now. As long as host.example.com DNS lookup returns one IP that belongs to the current 
server the proxying is skipped.

3. auth_proxy_self = setting means that if proxy_maybe=yes and host= then Dovecot assumes that this is a local login and won't proxy 
it, even if isn't the actual local IP. This can be helpful if the host field contains load balancer's IP address instead of the server's. You 
can add more than one IP (space separated) and of course everything related to this works just as well with hostnames as with IPs (even when hostname 
expands to multiple IPs).


On 27.02.2012 16:30, Tomislav Mihalicek wrote:
> I have a proxy setup for pop/imap. The proxies are defined in
> login_trusted_networks = x.x.x.x and for the imap it works fine but for pop3
> connections displays the ip address of proxy IP... Dovecots are both 1.2
> from the debian repo deb http://xi.rename-it.nl/debian/
> stable-auto/dovecot-1.2 main
> thanks

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