And this is a problem I constantly run into with web services, some throw an error if I use a ., others throw an error if I try to do something like example+not

And this is a problem I constantly run into with web services, some throw an error if I use a ., others throw an error if I try to do something like example+note@example.com. I use one or the other to help sort emails. It's even worse when a sign up form accepts an email in the latter format, but the login form does not for some reason. So I have an account with a note added but I cannot login. I had this problem with the Odeon website for a while, eventually had to phone them up and ask them to change my accounts email address to one without a note.