Manual:$wgEnotifFromEditor/en

Details
If true, sets the From: address of email notification as the email address of the user who made the edit. Otherwise, the email notification appears to be sent from the wiki server administration address.

If the user who made the edit has not provided an email address, or has not allowed their address to be disclosed, the email will appear to come from.

You need to set  to true for this setting to take effect.

If  is false, this setting is ignored.