OpenDMARC is segfaulting. That's what 'signal 11' means. Postfix fails to get an answer to its end-of-body milter call because of the segfault closing the other end of that socket. That failure results in Postfix sending a 4xx to the client. First step is to verify your installation of OpenDMARC. Make sure you have a current version, that its dependencies are consistent with the build, etc.
I ran into the same problem. I found that the opendmarc package in Debian bullseye is vulnerable to CVE-2021-34555, and I believe this is the source of the crash (in combination with the new email headers from the mailing list transition). I solved the problem by upgrading to the version of opendmarc in Debian testing.
I am using RHEL8 and after checking for updates I was able to update opendmarc to 1.4.2 (from 1.4.1) however it still has the error, only with mail from this list. In the mean time as suggested, I added "list.sys4.de" to the ignorelist to be able to accept list mail again. However i would like to solve the problem and not rest on a band-aid. _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
