[Samba] Winbind type email

[Hamish]

Hello all
Sorry to post this hugely off-topic, but i have no clue where to start. 
We are looking to replace an Exchange server with something with less 
licencing issues, is there a way to use windbind (or winbind-ish 
behaviour) for an email server (ie users authenticate through winbind to 
log on to imap server etc).
Once again, sorry for the mispost, even a push in the right direction 
will help!
Thanks,
H
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