Email validation does not follow RFC 5322

Description

When trying to create a profile for the mail address LONG_HASH@yggmail, the client told me “Please provide a valid email address.” even though it should be a valid mail address after RFC 5322.

To Reproduce…

1.Create a new account
2. Type something@yggmail into email field
3. Continue button stays grey and top says Please provide a valid email address.

Expected Behavior

Let me continue with account setup

Setup

Additional Information

This was talked about at Add DNS-based aliases · Issue #6 · neilalexander/yggmail · GitHub