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Symptoms

JIRA is unable to retrieve messages from an IMAP server and displays error messages like the following in the logs:

Cause

The Java mail library used by JIRA is not configured to use TLS for non-SSL connections by default. If you connect to an IMAP server without using SSL, and the server is not configured to allow unencrypted connections, you may see the error shown above.

Resolution

There are several ways to resolve this problem:

  1. Switch to using an SSL connection to communicate with your IMAP server. Please note that you may need to import your IMAP server's certificate in order for this to work properly.
  2. If you are connecting to your IMAP server over an unencrypted connection and then using TLS, set the following property:

    See Setting Properties and Options on Startup.

  3. Allow unencrypted communications between your JIRA instance and your IMAP server (not recommended).

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