How to process (filter) incoming spam emails?

Question

Mail server

Greetings
The site has an email address ([email protected]) and, of course, this address has already been included in the spam databases. Mailings like "Check your Sberbank account; Use the services of the best site promoter in all of Russia; Our services are the best; etc.", to put it mildly, are boring.
Religious reasons do not allow using POP / IMAP Google / Yandex, sorry, but there is no such possibility, period.
I tried to connect the domain to the mail.ru service for business, but when sending a message from the form, it is noticeable, even visually, that the sending slows down by 0.5-2 seconds. Therefore, this option is also excluded.
Email clients for operating systems like Thunderbird don't handle spam, just like Android clients.
In connection with the current situation, I ask for your help in finding / selecting options for protecting against spam emails with their filtering. What would be helpful?
PS
Website hosted by beget (shared)

Answer 1

Raise your mail server or put mail gateway in front of the mail server on which you filter.

Answer 2

Raise your mail server. And already on it to deploy any filtering system according to any signs. I use spamhaus, spamcop, dnsbl blacklists plus greylisting. True, the presence of greylisting significantly complicates relations with mail.ru and some other "especially smart" mailers who put such a bolt on postal standards...

Answer 3

As already mentioned, your own mail server and a comprehensive filtering system, including specialized software such as Spamassassin / RSPAMd. And years of training to fine-tune them. :-)