/usr/share/doc/maildrop/README.dovecotauth is in maildrop 2.7.1-1.
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** Copyright 2009 Marko Njezic
** Licensed under the same terms as Courier Authlib AND/OR Courier Maildrop.
When you patch maildrop to include Dovecot Authentication extension, you'll be
able to do user database lookups against Dovecot. This extension can happily
coexist with Courier Authlib extension if it is also compiled.
In order to use it you'll need to specify additional option "-t" that will point
to the location of Dovecot's auth master socket when starting maildrop in
delivery mode. For example:
maildrop -d USER -t /var/run/dovecot/auth-master
By specifying "-t" option, maildrop will first try user lookup against Dovecot's
database. If user is not found, maildrop will fallback to local user database
(i.e. passwd), as usual. Lookups against Courier Authlib will not be done when
"-t" option is specified. If you want to perform such lookup when both
extensions are compiled, simply remove "-t" option and maildrop will behave as
usual.
One significant difference compared to Courier Authlib extension is that Dovecot
Authentication extension will never return uid/gid that's equal to zero. If such
value was returned from database, maildrop will exit with temporary failure.
This was done in order to prevent accidental mistakes. If you really want to
deliver as/to root, you'll have to start maildrop without "-t" option and let
it directly query system user database on its own.
Make sure that correct permissions are set on Dovecot's auth master socket so
that maildrop can communicate with it. Also, depending on what type of users are
being served from Dovecot's database, if user lookup returns local user
accounts, you may end up with problems when maildrop tries to write mails to the
spool directory if wrong permission are set on it, since maildrop will reset its
permissions (uid/gid) to the values returned from user database. This behavior
is the same as the behavior of lookups against Courier Authlib, since they also
reset maildrop's permissions. When you want maildrop to deliver to the local
users, it's best to let it directly query system user database on its own,
since then it can apply its own "RESET_GID" magic, which will hopefully result
in "correct" permissions that will allow maildrop to write to the spool
directory.
And last but not least, I hope that you'll find this extension useful.
Especially if you already have an existing user database in Dovecot, but would
like to use maildrop (with its powerful "xfilter" command) to deliver e-mails,
without setting up another authentication user database, like Courier Authlib.
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