If there have any Mention plugin for 4.2.7? over due day reminder for watcher list ?

Added by Terence Lien 9 months ago

as subject,
the email notify is send to assignee and watcher,
but in some cases, just the reply, note needs to nofity someone,
if can use mention function on 4.2.7 will be great.

and the reminder of due day only for assignee, is there have any plugin for watcher?

thanks a lot.