outlook ios
I just set up my personal domain on my iCloud account. It's working fine on my Apple Mail accounts on my Mac and iPhone.
My employer only supports Microsoft Outlook and I prefer to have all of my mail accounts in one app. To set up my personal domain email address in MS Outlook for Mac, I just set it up like an iMap account and it worked fine.
https://support.apple.com/en-us/HT202304
When I went to set it up in Outlook on my iPhone, there wasn't an option to enable ssl nor an option for smtp authentication.
I tired just auto-setting it up as an iCloud email account, but Outlook won't accept any email address other than me.com or iCloud.com
iPhone X