Possible to adjust username used to determine the proxy destination?

[Steffen Kaiser]

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On Mon, 24 Nov 2014, Andy Dills wrote:

> I'm in a fairly standard cluster environment: shared storage, bunch of
> servers each acting as both proxies and backends.
>
> We do /bin/checkpassword authentication, allowing a great deal of
> flexibility...protection against brute force, billing mechanisms, but
> relevant to this issue, I have it set up to allow users to login with
> either their username (if they are in one of our default domains) or their
> email address.
>
> I'm realizing now that as a consequence of this, "joe" and "joe at xecu.net"
> are unique as far as dovecot is concerned. Users who login with just their
> username (and not the full email address) can get assigned to a different
> backend server than when they login with the full email address (which
> would also include LMTP deliveries). This has been happening for years, a
> few broken indexes here and there that seem to resolve themselves, so it
> hasn't been impacting the service, but I'd like to correct it properly.

Can return Dovecot Extra Fields as describes in:
http://wiki2.dovecot.org/AuthDatabase/CheckPassword
? userdb_user should change the username.

> Is there a way to manipulate this? For example, if I moved the
> authentication to the proxy layer (it's currently proxy=y nopassword=y),
> and set $ENV{USER} to the full email address, will director use that for
> selection instead of the user-supplied username?

Dunno

- -- 
Steffen Kaiser
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