Сервисы

HTML

https://litmus.com/ - сервис теста верстки под почтовики.
https://emailsoldiers.ru/blog/html-guideline/ - инфа по верстке html писем
https://habrahabr.ru/post/252279/ - инфа по верстке html писем

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Сервисы

HTML

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Join the 4+ million users, and keep the JSFiddle dream alive.

Ad-free

Use pre-released features

Fiddle collections

Private collections and fiddles

Console