Last time I was looking for a preferably european mail host for a new project I looked at Proton but they did not seem to have support for transactional mail.
In the end I settled on Zoho, not European , but not US either.
Yes, but for simplicity I was looking for a provider that had both mailboxes as well as a transactional mail solution for a SaaS project I am working on.
In the end I settled on Zoho, not European , but not US either.