How to write a letter correctly?

Question

PHP

Server, everything is set up correctly, letters reach everywhere. But I had a question, but how, when sending, for example, to the same gmail, to make sure that the letter gets into the "Notifications" folder, etc.?

Answer 1

Good afternoon!
Much more often, the opposite question is asked - how not to get into folders, for example, the Promotions folder.
Maybe this article will help
https://sendpulse.com/ru/blog/how-to-avoid-promo-t...