How well does it integrate with cPanel? Any customer complaints? Thank you.
well, outgoing can be integrated with exim to route all mail through them. We don't use the incoming cpanel plugin - accounts are manually created using their API. I can't speak on how the plugin is but I think it just takes them to the spampanel login using sso.
we've had no complaints, other than emails getting flagged from going out occasionally which in the end tends to be non-compliant emails anyhow.
Depending on the number of domains you're looking to filter, the price can add up for incoming and outgoing.