[Dovecot] Authentication with lower case username ONLY

[Leander S.]

  Hi,

how do you guys force your users to authenticate with lower case letters 
ONLY? Or convert it?
Is there a SASL Option to force that - or are you using scripts i.e. a 
bash script in combination with the command "tr" ... or a third solution 
I didn't think of yet?


I'm using Postfix / Dovecot combination. Postfix is told to use Dovecots 
SASL Service to authenticate it's users.
For my outgoing eMails I already wrote a script with tr which forms 
upercase usernames to lowercase ones ... but it's not enough. 
SpamAssassin is still confused and writes uppercase letters in it's 
Database etc. ... So that's why I'm looking for a more universal solution.


P.S. I would basically prefer a convertation - but I would also be fine 
with a forced lower case auth system.



Thanks & Regards