This is a useful tool for many WP admins.
A trivial request: I wonder if you would consider changing the subject line to something more informative, specifically what site. So instead of
"Someone has tried logging into wordpress. Review the info."
perhaps something like:
"Login Event: [site_url]"
Right now the "tried" msg is the same if a user does just try or if they actually do log in so an "event" is a better description.
Anyway, thanks for the plugin. I'll let it play for a few weeks and if anything pops I'll pass it along.