SMTP, OrangeWebsite and using your own computing resources
Mail has been designed long ago, perhaps by accident, as a decentralised federated service. We should exploit this good design by using multiple small instances. José and I were speaking not long ago about the GNU Project being, again by accident and at least to GNU hackers, one of the remaining providers of email services not affiliated with mass-surveillance entities such as Google. We need more entities like it, even smaller than it and together more resilient to surveillance and censorship.