Mail Handler creating duplicated comments

Summary

Mail handlers are creating duplicated comments. It seems like what happens is:

• JIRA processes email for more than 60s.
• while JIRA is still processing email, the connection drops (http 499 on nginx).
• JIRA finishes adding comment but cannot respond.
• The mail handler retries reading the mail box and the process repeats.

Environment

Steps to Reproduce

1. Send an email with attachments to a mail handler with the default timeout (1 min)

Expected Results

The mail handler should process this email and add a comment to the issue

Actual Results

The connection to the mail server closes before the handler is done processing the email. Therefore that email is not removed from the mail server and at the next run the handler will process the same email again, creating duplicated comments.

Notes

Similar to this other bug, https://jira.atlassian.com/browse/JRACLOUD-67475

Workaround

Increase the delay configuration in the mail handler