I run my own mail server in the UK on an FTTC line too, run off a more expensive ISP who take there network two seriously so I'm reasonably safe from being blac

I run my own mail server in the UK on an FTTC line too, run off a more expensive ISP who take there network two seriously so I'm reasonably safe from being blacklisted due to other users on nearby ranges if I don't cock up myself (no significant issues in the last decade and a half). A friend who also has their domains going through my server did have Gmail give some recipients "are you sure this is the person you think you are taking to?" warnings a while back due to us but having DKIM setup for that domain, so I would say that is becoming necessary these days.