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.
Yes, I understood the problem to be something is "breaking" in opendmarc and
postfix is soft bouncing based on service/milter not available. What i don't understand
is why this is happening only with the new list host. This hasn't happened with any other
server and while this is going on my server is still accepting and delivering mail from
other mail servers without issue. Right now all list mail is bouncing so please CC: me
directly so i may receive replies.
As far as i know everything is up to date.
[root]# opendmarc -V
opendmarc: OpenDMARC Filter v1.4.1
SMFI_VERSION 0x1000001
libmilter version 1.0.1
Active code options:
WITH_SPF
WITH_SPF2
I know this is going out of scope so i will reach out to the opendmarc list.
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