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question: Why does my mail client show a certificate for an FQDN I do not know? #3955
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area/networkingissue/likely user-related misconfigurationThis issue is likely the result of a misconfiguration on the user's endThis issue is likely the result of a misconfiguration on the user's endkind/questionSomeone asked a question - feel free to answerSomeone asked a question - feel free to answermeta/closed due to age or inactivityThis issue / PR has been closed due to inactivityThis issue / PR has been closed due to inactivitymeta/staleThis issue / PR has become stale and will be closed if there is no further activityThis issue / PR has become stale and will be closed if there is no further activity
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area/networkingissue/likely user-related misconfigurationThis issue is likely the result of a misconfiguration on the user's endThis issue is likely the result of a misconfiguration on the user's endkind/questionSomeone asked a question - feel free to answerSomeone asked a question - feel free to answermeta/closed due to age or inactivityThis issue / PR has been closed due to inactivityThis issue / PR has been closed due to inactivitymeta/staleThis issue / PR has become stale and will be closed if there is no further activityThis issue / PR has become stale and will be closed if there is no further activity
📝 Preliminary Checks
👀 What Happened?
I have been having the problem that my mail server is sending me a mail.mailnox.de certificate. I have always used Let's Encrypt for my certificate. This certificate is also on the server and is used by the docker container. Outlook and the Mail CLient v on IOS have been showing some mail.mailnox.de certificate for a few days now. This cannot be checked, so I always get an error message. I have renewed and recreated the certificate. Unfortunately without success.
Is it perhaps because I am exporting the Let's Encrypt certificate via the nginx-proxy-manager? I have also used ZeroSSL as an alternative. The error briefly disappeared there.
What Outlook shows
What I actually uploaded to the server
👟 Reproduction Steps
No response
🐋 DMS Version
v 13.3.1
💻 Operating System and Architecture
Debian 11
⚙️ Container configuration files
No response
📜 Relevant log output
No response
Improvements to this form?
No response