Email Block: Should not assume username

[CptPlastic]

Describe the bug
Username field in email block should not assume username is always an email address.

To Reproduce
Steps to reproduce the behavior:

1. Use email block
2. Set up ne provder
3. Username now assumes its an email address.

Expected behavior
It should not assume that the username is always an email address some setups are api keys or non-email. This was introduced via last update.