md_5 Well-known member Licensed customer Jul 23, 2015 #1 Running an older XF build, but I can't recall seeing any fix.
Chris D XenForo developer Staff member Licensed customer Jul 23, 2015 #2 XenForo doesn't send email alerts when a user is tagged. This must be coming from an add-on.
Martok Well-known member Licensed customer Jul 23, 2015 #3 It's the Tag Me add-on. You'll need to ask for support in its discussion thread.