https://proton.me/blog/email-hosting-small-business
This article will show you why choosing the right email hosting provider is a critical step in your small business operations.

https://www.dropboxforum.com/idea/101002013/dropbox-to-offer-business-email-hosting/432415
I reckon a lot of businesses use Dropbox as their preferred collaboration tool however they also have to get Office365 or Gsuite to host business email...

https://www.reddit.com/r/email/comments/16oo2re/email_service_providers_for_business/
Rackspace is a dedicated email hosting provider that focuses on business email solutions. It supports multiple domains and users, and it's known ...