How to Send HTML Email in Gmail (3 Easy Options) - GMass
https://www.gmass.co/blog/use-custom-html-in-gmail-compose-window/
Aug 30, 2021 · Creating and sending your HTML email in Gmail Step 1: Write your HTML. For this example, I’m using some boilerplate HTML adapted for our purposes. HTML can be either written directly or, possibly, composed with an HTML authoring tool. Gmail is a little picky with what it will allow as HTML in its emails, so here are a few important guidelines:
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