For me it's path-dependence ... we're already hosting a few sites, used to host stuff for a foundation, plus their site sent a lot of newsletters. Nowadays I c

For me it's path-dependence ... we're already hosting a few sites, used to host stuff for a foundation, plus their site sent a lot of newsletters. Nowadays I can wholeheartedly recommend Mailgun for outgoing mail. For personal/incoming ... well, Proton seems okay-ish.