Add email addresses to suggested words?

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?

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