Ok, new problem.

Sender: i...@example.com
dkim: Does work
Domainkey: Does work

Sender: i...@differentdomain.com
Dkim: Does work
Domainkey: Does NOT work

Our sender map looks like this:

# sign i...@differentdomain.com
i...@differentdomain.com        dkim(d=example.com), domainkeys(d=example.com)
# sign example.com mail with both a domainkeys and dkim signature
example.com           dkim(c=relaxed,a=rsa-sha256), domainkeys(c=nofws)
mail.example.com      dkim(c=relaxed,a=rsa-sha256), domainkeys(c=nofws)

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