I doubt this is related, but I have discovered that if you don't let your router use whatever DNS server Comcast wants to use you get lots of DNS errors when trying to connect. I tried using both Cloudflare and Google DNS and ran into the same problems. Just today I switched back to Comcast DNS being set automatically and the DNS errors went away. Not sure why that would be, but could be a source of DNS problems you reported seeing in the Mailbird logs.
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