I chose them after a rather lengthy search.
Reasons for choosing them(pros)
- multiple "payment accounts" can share the same domain (securely), which was my primary reason for choosing them.
I.e. I cannot access my brother's mail in any way, even if we share the same domain, because he is his own admin.
- you can pay extra for more space (i.e. additional storage on a per gigabyte basis)
- extra "domains" and "aliases" for the mailboxes are possible and free (for a given number dependent on your subscription level)
- German company (i.e. EU company, which I care a lot about).
- They seem like an old-fashioned unix company that respect privacy, so my risk of being data harvested or used for ai training seems miniscule
- They seem to be financially stable and (if I remember correctly) around 40 employees which is a reasonable size
- They have a full online office suit (which I do not use)
Reasons not to (cons)
- you pay per mailbox, not per domain
- their business plans starts to expensive for my taste (so my business domain is at another hoster) as the business is basically revenueless currently. Shouldn't be a problem, if the business is "real".
I want to stress, that I am only a customer, no partner or affiliate or receive any benefit of writing this.