Many providers like Pressable, Hostinger, and Bluehost offer Professional Email powered by Titan Email.
Yes, it is still available for sale via WHMCS, but I suggest a direct integration with Panel Alpha so that users can log in directly through Panel Alpha.
This would be great to have, it just adds more value to an agency, and offloads work.
I got a reply from Titan, they require at least 12000 accounts to work with them 
so not sure if that’s a viable option for many of us.
Would be great to have an alternative, any suggestions?
That is probably a “killer” here 
But just that I understand, why would Titan be a good solution (compared to some other email solutions on the market). Can you provide a bit more info?
They integrate directly into wp-admin, so from a (end) user’s perspective, that would be great to have in one place.
For most agencies, email is a pain in the back, but still a required feature by many small businesses. Hence, an easy to use, easy to set up, fully integrated solution would be great.