One thing to consider about mailbox.org is that if you don’t use your own custom domain and keep an @mailbox.org address (which afaik is considered a best practice for privacy because it lets you “hide” in the crowd), if you decide to move on later they will make your old address available to others later.
I am using mailbox.org for years now.
One thing to consider about mailbox.org is that if you don’t use your own custom domain and keep an @mailbox.org address (which afaik is considered a best practice for privacy because it lets you “hide” in the crowd), if you decide to move on later they will make your old address available to others later.