How to set up sending from different domains on Bitrix?

Question

Exim

Good afternoon.
Tell me, please, how to set up sending emails by Bitrix from different domains?
It's just that there is a vds on which ISP manager is installed, several sites on Bitrix are configured in it. The sites are mostly tied to Yandex traffic rules, but a couple of them have their own dedicated mail servers.
Today I discovered that all mail goes through local exim. There are no mail domains in the ISP. Mail is sent on behalf of [email protected] In the message itself, the necessary addresses are already substituted in the from field, but Yandex swears that the sender is masked, and mail.ru sends mail to spam.
I have previously configured Exim to send via remote smtp, but in this case it sends all mail this way. And how to send to different smtp, depending on the domain?

Answer 1

Send via smtp, not local send.
Or add trusted senders for each domain in Exim.

Answer 2

Sites on Bitrix should be configured to send mail via external smtp servers. There must be either a built-in feature or an add-on. module for this setting. Then set up external mail servers.
Or, on the local Exim mail server, create the appropriate mail domains and mail users.