The certificate for SMTP over SSL is located in the following files:
For QMail MTA:
For Postfix MTA:
Note: Only QMail MTA is used in Parallels Plesk Panel version 8.x and earlier versions. Use instructions from this KB to define which MTA is used in Parallels Plesk Panel version 9.x and later versions.
For IMAP4 and POP3 over SSL, the following certificate files are used:
By default, these are self-signed certificates for “plesk” which are generated during Parallels Plesk installation. If you need to set up your own certificates, copy and paste your certificate and Private Key into the appropriate files and restart “qmail/postfix” and “courier-imap” services:
For version 8.6 and earlier versions:
~# /etc/init.d/xinetd restart
~# /etc/init.d/courier-imap restart
For version 9.x and later versions:
~# /usr/local/psa/admin/sbin/mailmng –restart-service
It is important that the client specifies the domain that the certificate is issued for in order to avoid a warning that the certificate name does not match that of the host you are connecting to. For example, if the certificate was issued for the “example.com” domain, then you should specify “example.com” as the connection string in your mail client preferences for SMTP/POP3/IMAP servers.