Should i use HTML comments in my email templates?

Question

Trying to see if there are any negatives to adding HTML comments to my html emails?

Any feedback is great.

Thanks

Answer 1

I don't think so. I've made several professional e-mail templates for Outlook that contained a little notice in the comments. I've never had any problems with that. I even had fun to see that I could find an e-mail sent by a customer, because Google had indexed it, including the comment. :D

It does increase the size of the e-mail a little, so use with care.

Answer 2

None, unless the number of comments are too many that they affect DOM parsing by the browser/email client and congest network traffic.