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.
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.