Code for client email in templates

I’ve tried a few variations from codes I already know, but none are working. Is there a code to include the client’s email in a template? I want it to say

“by email at ___________________.”

If there is a client email in TC, I want it to fill in automatically.

If there isn’t an email in TC yet, I want a blank line of 20 characters or so that they can fill in on a printed version of the letter.

Thanks :slightly_smiling_face: