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Bounce messages are not signed with DKIM #873

@link2xt

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@link2xt

Filtermail 0.5 deployment from #831 stores rejected messages in /tmp/filtermail-rejected and all of them appear to be MAILER-DAEMON messages. E.g. arcanechat.me sends messages about failing to deliver to users that are over quota without DKIM signature.

It seems to be a problem with our postfix configuration, there is a question on stackoverflow with a solution:
https://serverfault.com/questions/1145023/how-to-make-postfix-sign-non-delivery-notifications-with-dkim

We need to run bounce messages through OpenDKIM milter so it signs outgoing messages, and make sure outgoing filtermail does not reject bounce messages because they are unencrypted.

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