You can have as many domains/users as you want. (Unless it's like five billion and breaks the service or something.)
Generally phone access is third party through IMAP. On Android I personally use K-9 mail, but you can use anything that supports IMAP anywhere, which is a pretty good number of options for any platform.
Re:Purelymail – cheap, no-nonsense email
by Fire-Dragon-DoL on Friday July 02, 2021 @11:51AM
(#27713079)
Thanks for the response, suddenly this makes it very interesting!
I wish K-9 had snooze-email, it's the one feature (non-standard) I use a lot
How is the mailbox on phone? My major problem with email hosting is the lack of a decent mailbox service that's available on. Windows, android, linux that's either. One-time-purchase or open source. A monthly fee is fine if for unlimited users (I have a family)