Am 18.09.2013 09:43, schrieb Ben:
> As far as I'm aware, email is case insensitive?

yes, the localpart in theory is, but only fools would configure
m...@exacmple.com and m...@example.com for different users because
it doe snot work in the real world

> Dovecot however, seems to be taking offence at the fact that someone is 
> sending mail to u...@somedomain.xyz.
> Postfix has no issues handling it, it when it gets passed over to Dovecot 
> LMTP that I get log lines such as :
> 
> Sep 17 13:48:22 ukc-vm02-mx01 dovecot: auth: 
> passwd-file(u...@somedomain.xyz): unknown user
> 
> However u...@somedomain.xyz *DOES* exist in the passwd file.  Just not with a 
> capitalised domain !
> I am confused

RTFM

auth_username_chars            = 
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@%
auth_username_translation      = 
%@AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz

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