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I'm configuring OpenDKIM to sign miltiple domains with the same key on Pstfix. I followed this tutorial with s=mail and d=example.com.

  • SigningTable:

    *       mail._domainkey.example.com

  • KeyTable:

    mail._domainkey.example.com        %:mail:/etc/opendkim/keys/default.private

My TXT DNS record is on the main domain (example.com). It works great when I send an email from example.com using my FROM address as: anything@example.com.

The problem is with other domains using my Postfix server. When I send an email using my FROM address as: anything@example.net (I configured DKIM, DMARC and SPF on example.net's DNS zone) the DKIM signature is added but using d=example.net.

The DKIM signature failed only on Outlook.

dkim=fail(signature did not verify)

It passes on Gmail (DKIM:PASS), and I get 10/10 on mail-tester.com.

Esa Jokinen
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Demba
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  • As this was originally written it was really hard to understand the situation. – Esa Jokinen Apr 03 '21 at 15:27
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    This is probably answerable when looking at the `diff` between the the 2 resulting copies. Send the same mail to both a known-good recipient and to one failing to verify. – anx Apr 04 '21 at 20:26

0 Answers0