dkim-filter key retrieval failed

Question

I've set up dkim-filter on my mail server. I've set up postfix to use dkim-filter as the milter; However, I'm getting the following in my logs:

Jul  7 13:00:29 magni postfix/smtpd[6742]: connect from mail-vw0-f53.google.com[209.85.212.53]
Jul  7 13:00:29 magni postfix/smtpd[6742]: D0F802BC74: client=mail-vw0-f53.google.com[209.85.212.53]
Jul  7 13:00:29 magni postfix/cleanup[6756]: D0F802BC74: message-id=<....-....mail.gmail.com>
Jul  7 13:00:34 magni dkim-filter[7039]: D0F802BC74: key retrieval failed

Why am I getting that, and how can I stop it from happening?

Answer 1

Since this is an inbound connection it means you have misconfigured your dkim filter it is trying to sign instead of verify the message and cannot obtain the keys.