Hi, I posted this to support desk but didn't get any feedback yet. Perhaps this is some unwanted behaviour of the email function. Tested with

Software Version
MediaWiki 1.23.2
PHP 5.4.12 (cgi-fcgi)
MySQL 5.1.49-community

I use $wgUserEmailUseReply in my configuration and it works for user to user emails.

There is $wgPasswordSender in the from: field and the users Email-Adress in the reply-to as should be.

But

When the user activates

Email me a copy of my message

this mail has the users email-Adress in the from: field instead of $wgPasswordSender as expected.

I'd like to have the $wgPasswordSender the from: field in both cases. How to do this?

By the way:
There is Text on the email user page that does not fit when $wgUserEmailUseReplyTo is set:

The email address you entered in your user preferences will appear as the "From" address of the email, so the recipient will be able to reply directly to you.