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I've installed opendkim with postfix on Debian Wheezy. Outgoing mail is getting DKIM signatures. The smtpd and non-smtpd milter spec is the same.

Incoming mail seems not to be verified - in a mail client there is no Authentication-Results header. I've added "AlwaysAddARHeader yes" to the opendkim config, but no difference.

In the mail log, on receipt of a message, among all the various entries there are two by opendkim. The first identifies the server and adds "not internal" (which seems reasonable when it is Google). The second just says "not authenticated". But I can't see any reason why it's not authenticated! Where can I look for the solution?

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The "not authenticated" may be just because the remote mail server is not signing their messages. Not everybody out there is signing their emails with DKIM. In fact, this mechanism is not so widely implemented as it should be. That being said, the fact that you use DKIM it's going to greatly improve your mail deliverability, but don't expect that everyone sending mails to your organization use it as well. DKIM it's growing slowly in my humble opinion.

You may find interesting this DKIM deployment trends experiment.

Also, if you are sure that the remote server is signing their messages and your mail server ignores it, I suggest that you check for known bugs here.

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The incoming messages I'm talking about are definitely signed - the DKIM signature is in the email header. The problem is that there isn't an Authentication-Results header added by opendkim when viewing the email in Thunderbird. Other checks done on the mail server, such as SPF, have added headers. But not DKIM. –  user203826 Jan 4 at 23:25

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