Why do letters from a site that is on Bitrix end up in spam on buzz mail and how to fix it?

Question

1C-Bitrix

Why do letters from a site that is on Bitrix end up in spam on buzz mail and how to fix it?
Both letters to admins and letters to clients fall into spam.

Answer 1

mail-tester.com will tell you what to fix

Answer 2

1.
Because your company does not have a postmaster on staff.
2.
How to fix it - hire a postmaster.