JIRA DC 11.3.5 version JIRA was creating ticket even if Maibbox ID is in DG till last month. All of sudden it stopped working.
If email sent to Mailbox directly it do work.
Could you check whether https://support.atlassian.com/jira/kb/not-receiving-e-mail-request-in-jira-service-management-using-exchange/ helps?
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