Do:
- Make it responsive; max width 600 pixels and max height 1200 pixels.
- Have all correct URLs embedded in the HTML and any images hosted.
- Use 150 words or less in the entire email (including graphics).
- Place a call to action button at the top of the email (before the fold/scroll) and again towards the bottom of the email.
Don't:
- Have the entire email be an image as it may not load.
- Use a call to action like “schedule a demo”, “book a demo” or “call now”.
- Write out a website url in the text will get caught by the spam filters.
- Uses words like “Free”, “Click” or “Offer” in the text. If you must, then have the word be part of an image instead.