URL below says the JIRA mail handler refers to in-reply-to mail header to determine which issue JIRA should add an email as a comment to.
My question is where JIRA stores mail header information. (maybe in database?)
I want to know this to search missing emails which occasionally happen due to the header, like https://confluence.atlassian.com/display/JIRAKB/Comment+Handler+Is+Unable+to+Identify+Issue
Please note that comment mail handler first checks mail subject for any issue key, then checks the in-reply-to header and finally the References header in this table.
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