Incorrect SSL certificate is used for mail service when Premium Email by Kolab is installed

Symptoms

• Plesk Premium Email extension by Kolab is used in Plesk.

• Non-default SSL certificate is set to secure mail traffic at Plesk > Tools & Settings > SSL Certificates > Certificate for securing mail;

• Email traffic still uses Plesk Default certificate: How to verify that SSL for IMAP/POP3/SMTP works and a proper SSL certificate is in use;

• /etc/dovecot/private/dovecot.pem and /etc/dovecot/private/ssl-cert-and-key.pem files have different content:

  # md5sum /etc/dovecot/private/ssl-cert-and-key.pem /etc/dovecot/private/dovecot.pem
  232dd0e418d073758357452c825eafc1 /etc/dovecot/private/ssl-cert-and-key.pem
  5641ddb15e79c0fda43bcd7a5d5dc307 /etc/dovecot/private/dovecot.pem

Cause

This is a Plesk bug with ID PPPM-7808 which is planned to be fixed in future product updates.

Resolution

for Kolab version 16.3.0 and earlier:

1. Connect to the server using SSH.

2. Overwrite /etc/dovecot/private/ssl-cert-and-key.pem with content from /etc/dovecot/private/dovecot.pem:

   # cp -f /etc/dovecot/private/dovecot.pem /etc/dovecot/private/ssl-cert-and-key.pem

for Kolab version 16.3.3:

1. Connect to the server via SSH.

2. Restart guam service:

   # service guam stop
   # service guam start

Note: as a workaround for Kolab version 16.3.2 upgrade to version 16.3.3.