I have 3 main email accounts. The first of them is on Outlook, the second on Gmail. Both of those forward to a third email account which is hosted on a web hosting server I pay for, on my own domain.
On phone and desktop I use Outlook/Thunderbird to only read email from the third account, but I use the other two for different reasons, mostly logins: the Google one for Android/Play Store stuff, Google Docs, etc; the Microsoft one for Xbox Music, Bing Rewards, Office, etc. I use one for work, the other for family and friends. I use 2 factor authentication on both of those accounts.