id summary reporter owner description type status priority milestone component version severity resolution keywords cc focuses 23430 sanitize_user() disallows + in usernames causes problem for email as username jb510 "I want to use email addresses as usernames which seems to work fine, except sanitize_user() doesn't allow a + in the username and my email addresses have + in them. Google/gmail allows one to use a + modifier on emails like so: user+admin@gmail.com, user+editor@gmail.com, user+author@gmail.com, etc... I often use this to get around WordPress's requirement for unique email addresses but it's also intended for and useful in filtering: user+blog1@gmail.com, user+blog2@gmail.com, etc... Is there a reason we can't allow +'s in usernames or could it be moved to the strict case only? See formatting.php:892 " enhancement new normal Users 3.5.1 minor has-patch