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On Sep 25, 2001 16:11 postfixxtremedev.com wrote:
> I'm running into a problem with user case sensitivity in emails.

On Sep 28, 08:00 Rod... Whitworth <listenerwitworx.com> replied:
>>>
Read RFC2821:
Verbs and argument values (e.g., "TO:" or "to:" in the RCPT command
and extension name keywords) are not case sensitive, with the sole
exception in this specification of a mailbox local-part
                                     ^^^^^^^^^^^^^^^^^^^
So why should Postfix break that?

It was the same IIRC in RFC821 so anything that lcases your localpart
is broken. Fix the sender.
<<<

To answer your question, I will quote Wietse's excellent reasoning:
On Nov 17, 2000 Wietse Venema <wietseporcupine.org> wrote:
>>>
Reason for the case insensitivity: even though RFCs say that the
left-hand side case should be preserved, it is not reasonable to
expect that remote senders will remember the "right" CaPiTaLiZaTiOn
of an email address. It just is not practical.
<<<

So, that makes sense. BUT, looking thru the RELEASE_NOTES, one can
see that this behavior has changed since snapshot-20010808, where we
get this tasty morsel:

> The Postfix pipe delivery agent no longer automatically case-folds
> the expansion of $user, $extension or $mailbox command-line macros.
> Specify the 'u' flag to get the old behavior.

I ran into this problem myself today when I upgraded from
20010228-pl03, and had to fix it. So, in the interest of the greater
good, I present the solution:
As the above hints, you have to add the `u´ flag to the pipe delivery
agent. If you are running Cyrus (as I am), you will replace the line
in master.cf which reads (lines might get mangled a bit by PGP):

cyrus unix - n n - - pipe
    flags=R user=cyrus argv=/usr/cyrus/bin/deliver -e -m ${extension}
${user}

with one that reads:

cyrus unix - n n - - pipe
    flags=Ru user=cyrus argv=/usr/cyrus/bin/deliver -e -m
${extension} ${user}

That it, the whole big enchilada!
The default operation of the current Postfix snapshot, in this
regard, is per RFC and you must use the option above in order to have
what some people would call `broken´ functionality. In this regard
I, for one, disagree with the RFC because from a usability point of
view it's hell for the mindless corporate users ("What's this, a
cupholder?" ;)

P.S. If you are running something other than Cyrus, it's the same,
because the flags are for the `pipe´ program, which are part of
Postfix (`man pipe´).

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