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as a direct product of enshittification, google and friends routinely undermine the open internet and make life difficult for people who selfhost, businesses and private parties alike.
so your emails not arriving in gmail’s inbox is because google wants you to use gmail and/or their business account, not plain email. there is no mechanism where you can mark a non-gmail correspondent as safe and someone you always want to receive comms from. except, if you offload your sending either to g&f or one of the 3rd-party senders like mailchimp, sendinblue, etc. who have a direct pipe into google’s infra and are not subject to any of those harassment tactics.
so, not having a .com domain is possibly less ideal, but that pales in comparison to the above; if you’re communicating with non-gmail/outllok/etc contacts, it don’t matter. if you do - again, it doesn’t matter.
upgrade went without a hitch (docker), only thing needed changing is the web UI password in docker-compose.yml. everything works, UI is infinitely faster, first impressions very positive.