[Dovecot] Mailboxes separated from IMAP server

[Regan Yelcich]

I've got a working setup very similar to this.

You want to setup server C as a proxy to B. Server B also needs to have Dovecot IMAP running on it so it has something to proxy to = IMAP <PROXY> IMAP

I'm using MySQL as the backend for Dovecot, so depending on how you're setup this should give you the basic idea anyway.

In your dovecot.conf file on Server C you just need to specify a Proxy as part of the password_query...

password_query = \
	SELECT \
		 password \
		,username AS user \
		,'y' as proxy \
		,'<IP ADDRESS OF B>' as host \
	FROM \
		mailbox \
	WHERE \
		username = '%u' \
		AND active='1' 



On 22/10/2013, at 8:48 AM, Charles Marcus wrote:

> On 2013-10-21 3:23 PM, Reymer Antonio Vargas Solano <reymervargas at gmail.com> wrote:
>> At my university we are trying to implement a distributed email backend,
>> but I have some troubles,
>> 
>> The topology:
>> 
>> Server A: Postfix+LMTP # MTA
>> Server B: Dovecot+LMTP # Just mailboxes
>> Server C: Dovecot # POP3/IMAP
>> 
>> Right now the Server A can leave a received email to the Server B, but I
>> don't know how to communicate Server C to the Server B to retrieve the
>> emails.
>> 
>> I think that we should use IMAP protocol, but I am confused about how to
>> connect them, I don't know if we have to use a proxy IMAP server, or
>> another thing.