How to prohibit EXIM from sending to mail.ru?

Question

Exim

Is it possible to restrict delivery to certain servers, and force Exim to only send to those it needs.
Such a task is needed to be solved.
Forbid sending to mail / yandex - but send to everyone else except these.
and vice versa to another only on mail / yandex for other bans.
How to make such prohibitions by means of the exim config.
p/s PowerMTA and other MTAs don't use the features due to the large number of servers in different locations.
For help on the issue, a huge chocolate bar from me.

Answer 1

You would show your settings first.
Where users are stored, in the database or create system ones. There are, to put it mildly, a lot of filtering options
https://www.exim.org/exim-html-current/doc/html/sp...
https://www.exim.org/exim-html-current/doc/ html/sp...
As a rule, in the settings they write, if the user has passed authorization, then deliver the letter unconditionally, if not, go through all the filters. You need to add a filter to the branch for authorized users, in which you will compare the user and delivery rules, the rules can be stored in a file, or in the database.
https://habr.com/post/37195/
https://www.lissyara.su/articles/freebsd/mail/exim...
https://www.lissyara.su/articles/freebsd/mail/exim. ..