Add email addresses to suggested words?

[WilliamFields]

Is there any way to add email addresses to the list of suggested words when typing with the keyboard? The help says to highlight the misspelled word, then click the + symbol. But, I cannot highlight a whole email address and get the + symbol.

For example:

MyName@MyEmail.com

The "MyName" has a red squiggly and if I highlight that part of the address the + symbol appears, but if I highlight the entire address the + symbol goes away.

How can I stop from having to type in email addresses over and over and over?