[Dovecot] configure lmtp to deliver to email addresses case insensitively

Adrian Zaugg adi at ente.limmat.ch
Mon Dec 16 23:32:25 EET 2013

Hi Marcus

The change of adding an L to

	auth_username_format = %Ln"

indeed has the side effect, that LMTP delivers wrongly cased addresses.
But the main effect and disadvantage is, that authenticating logins with
wrongly cased usernames do also succeed, which I actually do not like to

Isn't there another solution? A feature request for a new option

Regards, Adrian.

Am 16.12.13 21:25 schrieb Charles Marcus:
> On 2013-12-16 2:36 PM, Adrian Zaugg <adi at ente.limmat.ch> wrote:
>> How can I tell dovecot to deliver "USER" to the mailbox "user" aswell? 
> "Username
> LDAP lookups are case-insensitive. Unless you somehow normalize the
> username, it's possible that a user logging in as "user", "User" and
> "uSer" are treated differently. The easiest way to handle this is to
> tell Dovecot to change the username to the same case as it's in the LDAP
> database. You can do this by returning "user" field in the pass_attrs,
> as shown in the above example.
> If you can't normalize the username in LDAP, you can alternatively
> lowercase the username in dovecot.conf:
> auth_username_format = %Lu"
> See: http://wiki2.dovecot.org/AuthDatabase/LDAP/PasswordLookups
> This really should be the default...

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