non lowercase names from goto, address, mailbox are causing some issues about postfixadmin HOT 3 CLOSED

I think you're asking if case is a problem ... and it shouldn't be ... at least for MySQL users.

http://www.postfix.org/virtual.5.html

CASE FOLDING
       The search string is folded to lowercase before database lookup. As  of
       Postfix  2.3,  the search string is not case folded with database types
       such as regexp: or pcre: whose lookup fields can match both  upper  and
       lower case.

from postfixadmin.

Looking up my IRC log (it was a private discussion) - the problem was something like Undefined index [email protected] in .../PFAHandler.php on line 708, and PHP array keys are case sensitive ;-)

from postfixadmin.

hmm, well, if the user or domain had been added with mixed case, then this - https://github.com/postfixadmin/postfixadmin/blob/master/model/PFAHandler.php#L767 would probably fail as it's trying to do :

$result = $this->read_from_db(array($this->id_field => $this->id));
if (count($result) == 1) {
        $this->result = $result[$this->id];
        return true;
}

Which ought to be equivalent to :

$this->result = reset($result)

from postfixadmin.