On Mon, 14 Dec 2020 18:46:15 +0200
iulian stan wrote:

> DKIM-Signature: ...
> h=...:List-Id:List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive;

If you sign these headers without adding them all once in your original
message, you are signing their absence.  This breaks DKIM and DMARC in
mailing lists. 

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