Still problems in v73 with mts-sta and _mts-sts for months now!

Improvements
1

For each domain in Mail-in-a-Box I got the same error since months:
MTA-STS policy is missing: STSFetchResult.FETCH_ERROR
MTA-STS policy is missing: STSFetchResult.FETCH_ERROR
MTA-STS policy is missing: STSFetchResult.FETCH_ERROR

Example configuration in Custom DNS:
|box.example.com | A | 144.x.y.z | [delete] |
|_mta-sts.box.example.com | TXT | v=STSv1; id=20250811T1800 | [delete] |
|mta-sts.box.example.com | A | 192.168.a.b | [delete] |
|example.com | A | 144.x.y.z | [delete] |
|_mta-sts.example.com | TXT | v=STSv1; id=20250811T1800 | [delete] |
|mta-sts.example.com | A | 192.168.a.b| [ delete] |

Hint: mta-sts.example.com The domain’s website is hosted elsewhere at address [144.x.y.z].

I did the same thing with three domains. Result: The same error for all three domains! All certificates are in perfect order!

2

Do I understand correctly you manually created these mta-sts A and _mta-sts TXT records in the Custom DNS section of Mailinabox? That should not be necessary. What happens if you delete theme there?

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3

Now, for box.example.com and each domain in Mail-in-a-Box I got the same error four times:
MTA-STS policy is missing: STSFetchResult.FETCH_ERROR
MTA-STS policy is missing: STSFetchResult.FETCH_ERROR
MTA-STS policy is missing: STSFetchResult.FETCH_ERROR
MTA-STS policy is missing: STSFetchResult.FETCH_ERROR

For box.example.com and all three domain’s website is hosted elsewhere at the same address [144.x.y.z].