DKIM passes everywhere apart from Yahoo!

Posted by Ian on Server Fault See other posts from Server Fault or by Ian
Published on 2010-03-28T16:42:44Z Indexed on 2010/03/28 16:43 UTC
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Hi, I'm using dkim-milter, Postfix on Ubuntu (I think I used these instructions for setting up). Anyway, using the reflectors such as Port25, BlackOps and Altn.com I get passes for DKIM:

X-DKIM: OpenDKIM Filter v2.0.1 medusa.blackops.org o2SGTMSg005616
Authentication-Results: medusa.blackops.org; dkim=pass (1024-bit key)
       [email protected]; dkim-adsp=pass

dkim=pass header.d=example.com (b=miSIxi7TMX; 1:0:good);

Authentication-Results: verifier.port25.com header.d=example.com; dkim=pass (matches From: [email protected]);

Yahoo gives this:

Authentication-Results: mta1031.mail.ukl.yahoo.com  from=; domainkeys=neutral (no sig);  from=example.com; dkim=permerror (key failed)

Where, obviously, example.com is my site address. Is anyone aware of anything different with Yahoo! that would stop these from signing?

TIA

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