@KH-DanielP you got a point for an email solution that could tied up a lot of staff and ressources when it comes to filtering and reputation management. I think it would attract spammers unless prices are increased a bit more then competitors offers OR a customer would need to have a valid hosting plan before oredering email hosting(As an addon)
I know that cPanel is working on "
Server Profile" which include Standard, Database, DNS or Mail node so this could lead to a solution for mail hosting an IMAP usage.
For my part, I'm looking at intergrating the new Zoho cPanel plugin to offer at least free 5GB mail boxes per user but I would loose the part that I can fully managed the services myself and fix issues with my customers. With ConfigServer MailScanner, it makes my life easier but stuck with limited SSD disk space unless I take a dedicated server but without RAID10, I would not feel comfortable to use one.
Bottom line is that I/we should have implemented our hosting packages to control a bit more the disk space customers uses. I've oversell a bit as I took the risk that SSD disk space would make a leap but it did not yet.
Let's hope
cPanel Server Profile will help us in the near future as soon as it hit phase 5. In the mean time, spinning off more VPS!