On Wed, 2021-06-23 at 15:52 +0100, Simon Harrison wrote: > Not sure if I'm supposed to do this, but as I like to document things > that I've found hard, I've put up a tutorial for getting dkim working > with opensmtpd. The link is below in case it might help someone now or > in the future: > > https://simonh.uk/2021/06/23/get-dkim-working-with-opensmtpd/ >
Note that with this setup you only sign mail received via the local unix socket. In other words: via the sendmail command submission. Also, if a mail is send via this way and smtpd is down it's "manually" queued by smtpctl (in sendmail mode) itself, which circumvents the filter code. If a mail is send over tcp via localhost it won't be signed, since it doesn't have have the filter statement. The filter command should be placed on each "listen on" statement you want the filter to apply. Maybe you intend it like this, but if you're going to post this it might become a pitfall for others. Anyway, thanks for sharing and hope it runs well for you.
