I’ll start with the information that I keep my pages on two identical servers with the same provider.
Domains assigned to one server are supported by Cloudflare without any problems. The domains from the second one have a problem receiving mail. And more specifically with receiving mail via Gmail.
My provider said that all records are correct. I completed all the steps from this manual (I added MX records and flushed DNSs at Google).
And nothing happened. The same “connection timed out” error pops up in Gmail.
What should I do?