Mac Mail reports “Connections to the server “b…com” on the default ports timed out.”
Host support says I can either ask Cloudflare for help “getting the mail for b…com to the server at ****”.
Or, I will need to change the DNS MX record for bigbeartools.com to eventually point to **** (typically accomplished by having a DNS A record for mail.b… pointing to ****, and then the DNS MX record pointing to mail.b…)
I fixed it by forcing server address for incoming and outgoing on mail clients. However, I also added an A record for mail.bigbeartools.com pointing to the server IP and then an MX record.
Your initial problem was that it appears that you didn’t have an A record defined for bigbeartools.com. However your fix is absolutely fine and in many ways preferable to just creating the missing entry as it means if you ever do add a record for bigbeartools.com it may be proxied by Cloudflare.