Any chance that Mailenable might create a MailEnable APS Connector for standard Plesk Control Panel?
I maintain a separate Mailenable email server and don't use either my Windows or Linux Plesk for email at all. It means more management but I think it's worth the tradeoff but I would like to automate email provisioning so that clients can manage their Mailenable email accounts from within Plesk but continue to keep email on separate server as I have it now.
I also use WHMCS to manage billing and provisioning so a WHMCS module would also solve the problem however it would have to be as comprehensive as the Plesk email management tool. Mailenable's web-based admin tool is a little sparse.
I'd be willing to pay for something like that with annual maintenance as long as it's reasonable.