Unable to add email recipient

[danielchu]

  Unable to add email address to recipient. Error message is Invalid email address. I've tried removing Java 8 and installed Java 7 but same result. Please see screen shot.

[MWareman]

That means what your trying to enter does not look like an email address.... Make sure there is no + character before the @ (it's a common one, but I believe it failed the email address check)...