[Felz]

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.

[Fire-Dragon-DoL]

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