Due to bug 24288 and bug 21733, the user often doesn't know why he's receiving a notification and is completely clueless about it, especially if he wants to opt-out.
MediaWiki:lqt-enotif-newthread and MediaWiki:lqt-enotif-reply should have a footer like enotif_body, which currently is:
To change your e-mail notification settings, visit
{{canonicalurl:{{#special:Preferences}}}}
To change your watchlist settings, visit
{{canonicalurl:{{#special:EditWatchlist}}}}
To delete the page from your watchlist, visit
$UNWATCHURL
Feedback and further assistance:
{{canonicalurl:{{MediaWiki:Helppage}}}}
And in that case $UNWATCHURL should probably depend on whether the message has been received due to watchlisting the thread or the talk page.
If such a dynamic linking is too much, at least it should be noted that the user may be required to unwatch both the thread and the talk and also to change the prefences about both.
Version: master
Severity: enhancement