Is it possible to make 2 different mx records in dns, and how will it work?

Question

Domain Name System

Good afternoon. The domain has an mx record for the Protonmail service. Employees of the organization like to use this service, but letters from the site go to spam. Is it possible to register the second mx record for example yandex and send letters from the site from there? Will this work and are there any other dns records needed for this to work correctly?

Answer 1

It won't work at all. while mx1 is available - everyone will send to it. If the port is disabled on mx1, mail servers will deliver to mx2.
PS You
can put the same priority on them, but the mail will reach 50%.
And yes, the main question is why MX? The MX record is not responsible for sending emails, only for receiving them. (indirectly, of course, it can be spelled out in SPF)

Answer 2

The problem is not very clearly described, but if "letters from the site go to spam" - then adding a second MX record will not solve the problem.
Research will solve the problem - why they go to spam, and perhaps this is due to the lack of correctly configured SPF, DKIM and DMARC for your mail domain.
Check your mail domain in any postmaster, for example mail.ru - https://postmaster.mail.ru/ and it will show you what needs to be done.