Trying to use uppercase names in Postfix.

Derek Broughton derek at
Mon Mar 9 17:47:00 UTC 2009

Rolf Kutz wrote:

> On 29/12/08 18:54 +0100, Markus Hitter wrote:
>>Am 29.12.2008 um 18:24 schrieb Xn Nooby:
>>> I am using Postfix to replace an existing  email system, and I am
>>> inheriting usernames that are in uppercase. Apparently Postfix
>>> converts all email addresses to lowercase, so I cannot receive mail to
>>> the accounts that are in uppercase. This surprised me, because the
>>> linux user accounts are in uppercase.
>>While Email adresses are case insensitive (jim123 at ist the
>>same as jim123 at Gmail.COM), Unix/Linux user accounts are case
>>sensitive. JIM123 ist allowed as well as Jim123 or jim123, but those
>>three are three different user names.
> Email is handled case sensitive most of the time,
> but local parts can be case sensitive.

One would think that one of those two cases should have been "case
INsensitive" :-)

More to the point, installing postfix _asks_ if you should use
case-sensitive aliases, iirc.  So try "sudo dpkg-reconfigure postfix".

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