Hi @Jens Prokoph
Your issue is probably being caused because the Jira email handlers are reading the header of the emails sent and they are returning Auto-Submitted: auto-generated, so the system automatically rejects the email.
In order to properly avoid this problem, you can configure your allow list to make the email handlers from Jira to stop filtering out those emails:
From your service desk project, select Project settings () > Email requests.
- Select Manage allowlist from the more menu
- Select +Add domain name.
- Enter the domain name and save.
You can check more details in the documentation below:
How are domains added to the allowlist?
Or if, your mail server is utilizing a distribution group to the email accounts in question.
Then create a mailbox for this mail address to handle incoming mail to this account rather than route it with a distribution group
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