Articles in this section

The default certificate is used for IMAP connection when the Plesk Premium Mail is installed

Daniel Yordanov
Updated
Plesk for Linux kb: technical

Applicable to:

  • Plesk for Linux

Symptoms

  • The default certificate is used for IMAP (993) connection when the Plesk Premium Mail is installed in Extensions > My Extensions:

    # openssl s_client -showcerts -connect exmple.com:993 -servername example.com | grep CN
    ... O = Plesk, CN = Plesk, emailAddress = info@plesk.com

  • But SMTPS (465) connections are secured with correct SSL taken from Domains > example.com > Mail Settings:

    # openssl s_client -showcerts -connect exmple.com:465 -servername example.com | grep CN
    ...CN = example.com
     

Cause

SNI configuration was broken for domain example.com

Resolution

Via GUI

1. Log into Plesk

2. Go to Subscriptions > example.com > Customize and temporary enable the options below in case they are not enabled:

  • Plesk Premium Mail
  • Plesk Premium Mail - Free

3. Go to Subscriptions > example.com > Plesk Premium Email and press the button Fix.

Note: This step can also be performed directly via Plesk > Plesk Premium Email > example.com > Click on the arrow to open the additional information

If Plesk Premium Email should not be used for example.com, disable it's settings back in Subscriptions > example.com > Customize:

  • Plesk Premium Mail
  • Plesk Premium Mail - Free
Via CLI

1. Log into the server via SSH
2. Execute the following command in order to force the synchronization of mail hostname information between Plesk Premium Email and Plesk itself:

# plesk bin extension -e kolab sync-guam-config.php

Was this article helpful?

Comments

1 comment
Date Votes
  • Avatar
    Pablo Alvarez

    If the Fix button is missing, this command will have the same effect:

    plesk bin extension -e kolab sync-guam-config.php
    1

Please sign in to leave a comment.