Hi @Kojo ,
Thanks for posting and welcome to the community.
As you have mentioned you are using Jira Server, Could you please check this documentation - https://confluence.atlassian.com/adminjiraserver073/creating-issues-and-comments-from-email-861253784.html? (check this section - Create a new issue or add a comment to an existing issue under Mail handler)
Please accept the answer if it helps else respond and allow others to share inputs.
Stay healthy and safe.
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