[Dovecot] Login with firstname.lastname instead of loginname - WORKING

[Ralf Hildebrandt]

3 years ago (!) I aksed about this and finally I implemented it today:

>>   # NEW
>>   passdb {
>>      driver = passwd
>>      # firstname.lastname at charite.de:password:uid:gid:(gecos):home:(shell):user=realloginname
>>      args = /usr/local/etc/dovecot.login_via_email
>>   }

>If you're only using it as a passdb, you don't need the uid/gid/home. So
>an example field would be:
>
>firstname.lastname at charite.de:password::::::user=realloginname

But now I'm encountering problems with users writing

Firstname.Lastname at charite.de
instead of
firstname.lastname at charite.de
(capitalized first letters)

How can I "normalize" the usernames by lowercasing them?

The coolest solution would be to strip realms AND force lowercasing of
usernames in one pass

-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebrandt at charite.de | http://www.charite.de