Thanks for this. I just used the default settings. So (1), I don't know how to move beyond the default settings (and going via "settings" doesn't offer me any options for changing them) and (2) nothing came up when I set the account up about my STMP settings? They didn't even feature when I set up the default email app on my phone (which has subsequently frozen, which is why I'm looking for an alternative). But it's *very* helpful that there's a thread about Office365 on this forum, so I'm grateful for your suggestion that I pursue that.
Thanks,
Nik.