I only occasionally had problems with outlook.com, I contacted them, their spam system is an outsourced blackbox. They advised me not to send mass emails... Which I don&#x27;t of course. Gmail and Apple never gave me any problems. Yahoo banned me after my first mail, no idea why but it seems to work now. I feel like I&#x27;m fighting the good fight (decentralize all the things!) so I&#x27;ll just accept the shortcomings, which are in general, not that many. There are even some nice things like I can have mail addresses that go to both me and my wife, unlimited spam addresses etc.