dovecot - Sep 2007 - Mixed Courier POP3 and Dovecot IMAP environment

Hi,

 

Currently we support Courier POP and IMAP for all our users (users can
use IMAP as well as POP at the same time).

We are thinking about moving to Dovecot; but first moving away from
Courier IMAP to Dovecot IMAP (and maybe later also move to Dovecot POP).

This would create a mixed environment; after some research I have the
following questions.

 

To not break POP3 Courier and still be able to use Dovecot IMAP:

-          I have to use the namespace prefix in the dovecot.conf file:
I read this in the wiki.

-          "Patch" the source so Dovecot IMAP will look for/use
'courierimapuiddb' instead of 'dovecot-uidlist': otherwise I
guess POP3
and IMAP users will have different UID files, right? Is this smart or
will this still break the UID file?

-          "Patch" the source so Dovecot IMAP will look for/use
'courierimapsubscribed' instead of 'subscriptions' of should I
just go
with the renaming of the files?

 

I'm thinking about patching so the transition can be as transparent as
possible: Also if anything might go wrong in production I want to be
able to switch back to the 'old' Courier IMAP (without renaming files
etc.)

Any thoughts on this?

 

Cheers,

 

Jan

> I'm thinking about patching so the transition can be as transparent as
> possible: Also if anything might go wrong in production I want to be
> able to switch back to the 'old' Courier IMAP (without renaming
files
> etc.)
>
> Any thoughts on this
I am going through the same process at the moment and I think the best 
solution is to start afresh

I have setup a new Dovecot server with the proxy stuff enabled.  I can 
then migrate accounts one at a time to the new machine and other users 
pointing at the new machine simply get proxied back to the old machine.

Can't easily roll users back to the old machine, but it does mean that 
we can do limited testing and not need to do a big bang approach

Ed W

On Mon, 2007-09-24 at 13:29 +0200, Jan van den Berg
wrote:
> -          "Patch" the source so Dovecot IMAP will look for/use
> 'courierimapuiddb' instead of 'dovecot-uidlist': otherwise
I guess POP3
> and IMAP users will have different UID files, right? Is this smart or
> will this still break the UID file?
Courier POP3 uses courierpop3uiddb (or something) file for POP3 UIDLs.
Unless you're using a really old Courier version.
> I'm thinking about patching so the transition can be as transparent as
> possible: Also if anything might go wrong in production I want to be
> able to switch back to the 'old' Courier IMAP (without renaming
files
> etc.)
I guess then you want to rename dovecot-uidlist. Courier's keyword
implementation is also different from Dovecot.

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In the past we also patched Courier; so Im not sure about the naming
what's right and what's not (I know for a fact what we use now:
courierimapuiddb) 

But you get the idea, right :) 

We currently don't support (Courier) keywords; so if we decide to
support/offer this we can start afresh with Dovecot.


-----Oorspronkelijk bericht-----
Van: Timo Sirainen [mailto:tss at iki.fi] 
Verzonden: zondag 30 september 2007 14:08
Aan: Jan van den Berg
CC: dovecot at dovecot.org
Onderwerp: Re: [Dovecot] Mixed Courier POP3 and Dovecot IMAP environment

On Mon, 2007-09-24 at 13:29 +0200, Jan van den Berg
wrote:
> -          "Patch" the source so Dovecot IMAP will look for/use
> 'courierimapuiddb' instead of 'dovecot-uidlist': otherwise
I guess
POP3
> and IMAP users will have different UID files, right? Is this smart or
> will this still break the UID file?
Courier POP3 uses courierpop3uiddb (or something) file for POP3 UIDLs.
Unless you're using a really old Courier version.
> I'm thinking about patching so the transition can be as transparent as
> possible: Also if anything might go wrong in production I want to be
> able to switch back to the 'old' Courier IMAP (without renaming
files
> etc.)
I guess then you want to rename dovecot-uidlist. Courier's keyword
implementation is also different from Dovecot.