Notice: This product has been discontinued as of 20th March 2019 from our product list. Any further development and all related support services would also be discontinued. You can, however, continue to use this product, and any related support services would come under our per hour administrative charge of $25 (USD).
SSL Manager for Mail (Plesk) supports Postfix as the mail transfer agent. Qmail is not supported as of now.
Both Dovecot and Courier IMAP are supported as the mail user agent. But, please note that the support for multiple SSL certificates in Courier IMAP is an experimental feature. Even though we received positive results in our testing with Courier IMAP, we cannot guarantee that multiple SSL will work perfectly in the future updates to Courier IMAP. So, we recommend using Dovecot as the MUA.
Only STARTTLS is supported by Courier IMAP. If you try and connect to any secure IMAP/POP3 port (993/995) it will have the default certificate only. Certificate assigned to a domain will be used in STARTTLS only.