We do it the same and it works fine, however we do it by inbound port (because we're behind some loadbalancers that can do port translation. We create a port -> domain mapping table and then you can just do the join with "where port = '%a'" (dovecot 1.1 only). Seems a little neater than the per-ip solution if you're in a loadbalanced environment. I don't see why you need the group by or having statements (assuming you have normalized tables).

Mark

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-----Original Message----- From: dovecot-bounces+mark.zealey=webfusion.com@dovecot.org [mailto:dovecot-bounces+mark.zealey=webfusion.com@dovecot.org] On Behalf Of Ian B Sent: 01 September 2008 09:29 To: dovecot@dovecot.org Subject: [Dovecot] usernames with/without domain - my solution

My existing pop3/imap environment is courier imap + vpopmail

• qmail with MySQL backend. I'm looking at migrating this to Dovecot.

Currently I have multiple instances of Courier bound to different loopback IPs (the IPs correspond with the virtual IPs on a server load balancer). When a user authenticates they don't have to specify a domain - if they don't, Courier will use a 'default' domain (defined in the Courier config for that instance).

Moving to Dovecot I want to avoid having to running an instance of Dovecot listening on each loopback IP, but still handle usernames that may not have the domain component.

I wasn't able to find any examples showing how to achieve this exactly, so came up with the following solution:

1. create a new 2 column SQL table: 'domain', 'IP' - this allows me to map between the local Dovecot IP and the 'default' domain
2. create a (rather ugly looking) sql query that combines data from both the vpopmail table and the new table

The SQL query is as follows:

SELECT IF('%d' = '',dovecot.domain,'%d') AS authdomain, CONCAT(pw_name, '@', pw_domain) AS user, pw_passwd AS password, pw_dir AS userdb_home, 89 AS userdb_uid, 89 AS userdb_gid FROM vpopmail, dovecot_authmap AS dovecot WHERE pw_name = '%n' AND dovecot.local_ip = SUBSTRING_INDEX('%l', ':', -1)
GROUP BY pw_domain HAVING pw_domain = authdomain

NOTE: I'm prefetching userdb info

This works, however I'd like to know what others think of this approach, and whether there is a better way to achieve what I require.

Thanks, Ian.

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