I've found for quite some time that I have to create a whole new email address for each mule I create... Something which is extremely annoying, and time consuming. However, so long as you use gmail (I haven't tried it with any other email provider), you can create multiple mules with the same email address. You just add a "." anywhere in the email. For example, if your email is kialand@ gmail.com, you would do this:
kia.land@gmail.com
Realm thinks of it as a whole new address, and gmail just ignores it and sends the mail to you anyway. You can also use a "+" to do this:
kialand+rotmg@gmail.com
Anyway, sorry if this is nothing new; figured I hadn't seen it anywhere, so may as well see if it helps anyone.
Did not create a mule in ages, was not aware of this. +1.