How to map email addresses to usernames?

[Steffen Kaiser]

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On Tue, 10 Oct 2017, Andreas Born wrote:

> For incoming mails via LMTP, my user_query from userdb is being executed with

I think from https://wiki2.dovecot.org/UserDatabase

you write user_query to accept any spellings of the user, I mean:

> bob at example.org => user-1
> eve at example.org => user-1
> ted at example.org => user-2
> @catchall.org   => user-3

user-1 => user-1
       ^ no domain from passdb lookup

Then have the extra field "user=" return the correct user string "user-1" 
along with its data. I'm sort of pretty sure, that I had such setup once 
ago. Currently, I let the MTA map all email addresses into the user name, 
your shown examples.

I mean, you have to avoid a scenario like:

passdb / userdb
bob at example.org => user-1 at example.net
user-1 at example.net => user-2 at example.net

- -- 
Steffen Kaiser
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