I've been using courier for 2.5 years on a personal server where I have a few
accounts that amount to about 20-30 emails a day. Up until now, I've been
accessing them via POP but have copies of everything all the way back on the
server in courier's ARCHIVEDIR.
The POP clients delete stuff from the individual account Maildir's after a
short period, but a couple of the machines use the same client software and
keep a syncronized archive of their own. The others, e.g. my phone, just
retain messages for a short duration.
I just physically migrated the server, and upgraded courier from 0.66.1 to
0.76.1 on the new machine. Everything seems to be working fine. However,
rather than continuing with the old methodology just described, I decided to
switch to IMAP for everything. I started with fresh, empty, new accounts on
the new server, with addresses corresponding to the old ones, and there are no
problems with delivery or access.
But I would like to integrate a backlog of the old messages, for which I have
the two sources just mentioned:
- A "local" archive from the synchronized POP clients; this has nothing to do
with courier, although the messages are in separate files and are identical to
what would be found in the server side Maildirs.
- A "remote" archive in ARCHIVEDIR.
I notice there's a subtle difference between the latter and what ends up in the
Maildir; the Maildir messages have a "Delivered-To:" and "Return-Path:" header
added. In the ARCHIVEDIR, this information seems to be kept in a separate file
with a 1-1 correspondence to the messages using a format I assume is courier's
but would be easy to parse if need be.
The issue with simply trying to insert stuff into the Maildir's on the new
machine is sort of two-fold. First, they obviously have a name created by
courier -- I don't know if this is according to a Maildir standard or not, but
they are different from either the names given to the files by the client
software in the "local" archive, and the names given to them by courier in the
ARCHIVEDIR. If it is according to a documented standard, it would not be hard
for me to create them from what I have and insert them except for the second
fold of the problem: courier also tracks them in a separate, per user account
file.
For the old POP accounts this is a fairly straightforward looking list. For
the new ones, this is a binary database of some sort ('courierimapuiddb').
What are my options here? I believe the message files in ARCHIVEDIR are the
messages as recieved by courier *almost* unadulterated; there is a "Recieved:"
header added. I could strip those off and ask about/figure out a way to feed
them to courier on the new machine *but* that "Recieved:" header includes a
date which I'm guessing is the definitive one.
I'm continuing to keep an ARCHIVEDIR on the new machine and it might be handy
to do something along similar lines later, so I'd prefer to work with that
stuff than what's in the "local" archive (since I won't be doing that in the
future).
Sincerely -- MK
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