DKIM parent domain and subdomain signing

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f.mezger
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Joined: 2019-10-23 10:44

DKIM parent domain and subdomain signing

Post by f.mezger » 2019-10-23 12:54

Hi,
I've a little question. Is there any possibility that i can sign a subdomain with the dkim signing of the parten domain an use the same selector.
So that i don't have to add the selector so every subdomain at DNS server.

Header example:

As it is:
Domain "domain.tld":
dkim-signature: v=1; a=rsa-sha256; d=domain.tld; s=selector;
c=relaxed/relaxed; q=dns/txt; h=From:Subject:Date:Message-ID:To:MIME-


Subdomain "subdomain.domain.tld":
dkim-signature: v=1; a=rsa-sha256; d=subdomain.domain.tld; s=selector;
c=relaxed/relaxed; q=dns/txt; h=From:Subject:Date:Message-Id:To:MIME-


Should be:
Subdomain "subdomain.domain.tld":
dkim-signature: v=1; a=rsa-sha256; d=domain.tld; s=selector;
c=relaxed/relaxed; q=dns/txt; h=From:Subject:Date:Message-Id:To:MIME-

Is there any way to configure it like this or i'm on the wrong way?


regards and thank you in advance

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