2025-12-30T10:11:35Z Hanno Böck via mailop <[email protected]>:
> Hello,
>
> While I have no insight into why Microsoft might've blocked this list,
> the mails I receive have invalid DKIM signatures. It appears the list
> retains the original DKIM signatures from the mail senders, rewrites
> the from address to [email protected], yet does not add its own DKIM
> signature for mailop.org. And mailop.org has a "quarantine" DMARC
> policy.
>
> So, technically, all emails from this list should be DMARC-quarantined
> by DMARC-complying receivers.
>
> Of course, I can't say if fixing that will fix the issue with
> Microsoft, but it probably should be fixed. If the list rewrites
> messages, it should remove any DKIM signatures that it breaks and add
> its own ones for its own domain.
>
> --
> Hanno Böck
> https://hboeck.de/
I don't think that DMARC is an issue here:
Authentication-Results: cheems.de.box.skhron.com.ua;
dkim=fail ("body hash did not verify") header.d=hboeck.de header.s=key1
header.b=gdQaN+MR;
dmarc=pass (policy=quarantine) header.from=mailop.org;
spf=pass (cheems.de.box.skhron.com.ua: domain of [email protected]
designates 91.132.147.157 as permitted sender)
[email protected]
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