Currently, users can choose whether they want to receive an email when someone someone sends them a PM as well as for “all the rest”:
Send me an email when someone quotes me, replies to my post, mentions my @username, or invites me to a topic
I’d like to suggest to move the mentions to a separate setting.
My reasoning is that mentioning someone’s username is of similarly high importance as a PM so that when I want to reduce email noise from “less important” sites, I would want to turn off all emails except PMs and mentions. Since I can’t turn off quotes, replies and nvites without turning off mentions I basically have to leave it all on (not that it’s a huge problem for me personally, thanks to POPfile, but I think it would be an improvement).