Case sensitive email addresses

[Bandit]

I have a client on my box that pointed out something interesting to me, so I tested it and he definately is correct.

If an email is addressed to user@domain.com they get it fine, if it is addressed to USER@DOMAIN.COM the email gets routed to the domains default mail route setup. Email accounts should no be case sensitive, or am I wrong in my thinking?

[LeeJ]

Run the command below.
touch /etc/courier/locallowercase


If this file exists, Courier will not distinguish being lower-
case and uppercase local accounts, so that john@example.com and
John@example.com will refer to the same local mailbox (where
example.com is your domain). Postmaster, postmaster, and POST-
MASTER always refer to the same account, even if locallowercase
does not exist.

Note: If locallowercase exists you cannot have any system
accounts that contain uppercase letters. locallowercase applies
only to local mail. Mail addressed to external domains will
always have the case of the addresses preserved.

[Bandit]

Thanks for the quick fix LeeJ...prompt and correct as usual!