How to type up letters for mailing (example or template)?

Question

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Hello! In the near future, I will have to type up letters for mailing lists.
Since I have not come across this before, but I heard that it has its own characteristics.
1. In this connection, I ask you to share an example, or maybe there is a blank template. Preferably cross-browser, adaptive.
2. Or advise a good material on this topic.
I think this topic will be of interest to many.

Answer 1

https://foundation.zurb.com/emails.html
https://foundation.zurb.com/emails/email-templates.html