Current Situation: Currently, if users make a mention to themselves, the mention is not sent. However, the reason for mentioning yourself might be either because you really wanted to be mentioned yourself or because it was a Freudian slip. In both cases it would be good to get notified.
Task: Allow mentions to self.
Pointers to the code can be found here: https://www.mediawiki.org/wiki/Help:Notifications#Mentions
Background: This task is based on a wish that received 21 points (#9) in the German Community Wishlist. Originally, the wish was to receive an information about the sent messages. To keep the number of notifications smaller, and to help people use mentions in a way that they are sent, the task informs about mention failures, and adds the reasons for the failure as well.
 Link to wish (in German): https://de.wikipedia.org/wiki/Wikipedia:Umfragen/Technische_W%C3%BCnsche_2015/Topw%C3%BCnsche#Bei_Speichern_Hinweis_.C3.BCber_abgegebene_Benachrichtigungen_.5BUmfrage_2015.5D
in English: https://meta.wikimedia.org/wiki/WMDE_Technical_Wishes#Notifications_about_failed_mentions