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How To Make Dovecot Strip Realm
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Easily the most common mail configuration error I've seen is for users to send user@eskimo.com as their username instead of just user.

Until recently this has been resolved by the user changing their configuration, however, recently I had an ATT mobile customer whose phone automatically attached the realm and apparently provided no option to send just the username on an imap or pop-3 login.

I Googled for a solution but didn't find a reasonable one. One person went so far as to make a patch to Dovecot but it also stripped the realm off in other contexts where it wasn't desirable to do so.

I found the solution, in all places, in Dovecot docs. Simply making the following change in 10-auth.conf:

Change: auth_username_format = %Lu
To: auth_username_format = %Ln

The 'L' tells Dovecot to fold the login to lower case, the 'u' is the full username including the domain, the 'n' is just the username.
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How To Make Dovecot Strip Realm - Nanook - 11-18-2013, 12:45 PM

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