On: Firefox Monitor

[mjlee]

To clarify the SMTP RFC (RFC 5321) says that a valid e-mail address is defined in RFC 5322 - Internet Message Format.

RFC 5322 does say that a `+` is a valid character in the local part of an e-mail address.

The `+` character being used for address aliasing is, as far as I can tell, not mentioned in RFC 5321 or RFC 5322

[jcheng → mjlee]

It's apparently a thing now:

https://tools.ietf.org/html/rfc5233