Auditing
JEMHC keeps track of all Inbound and Outbound Messages and any events that have been sent by Jira(events are triggered when there has been a change to any issues) and allows the Jira Admin to view and diagnose any issues that may have occurred when processing emails and events.
Retention
JEMHC Auditing is for a limited time, longer term audit retention should be done at the mailbox level, for example:
o365: https://www.hornetsecurity.com/en/services/365-total-protection/
gmail: ‘Vault’ https://support.google.com/vault/answer/6161352?hl=en
For more information see the following pages:
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