I have a Postfix send only server setup.
I am attempting to integrate OpenDKIM to mitigate the possibility of being blacklisted.
Whenever I send a message I see the following warning in the syslog:
> postfix/cleanup[19960]: warning: milter inet:localhost:12301: can't read SMFIC_EOH reply packet header: Invalid argument
Messages are still sent by Postfix, however the emails do not appear to have any DKIM related headers in them. I suspect that the warning above indicates that OpenDKIM is not communicating with Postfix correctly and as a result messages are not being signed.
I setup Postfix to use OpenDKIM in the Postfix main.cf file:
> milter_protocol = 2
> milter_default_action = accept
> smtpd_milters = inet:localhost:12301
> non_smtpd_milters = inet:localhost:12301
The output of postconf -n and postconf -Mf are in this GitHub Gist:
https://gist.github.com/Noah-Huppert/0e8160dd6a12e0c62292d1c3f5a262b8
This Gist also contains what I believe to be the relevant OpenDKIM configuration.
My efforts to debug this issue have mainly been centered around figuring out what the SMFIC_EOH error code means. However I have had no luck. Any help figuring out what this error code means or how to fix this issue would be greatly appreciated.
Best,
Noah Huppert
Received on Wed Feb 13 2019 - 05:29:18 PST