Refer upstream bug report and fix: https://github.com/trusteddomainproject/OpenDMARC/issues/183 This was a fairly serious issue for me. I have postfix using opendkim as a milter and a remote sender (ironically, the Postfix announce mailing list) was able to send a correctly formatted email in and completely crash my mail system because opendmarc could not handle the ARC header length. Even if I restarted opendmarc, when the remote re-attempted to send in again it crashed opendmarc once more over and over. I have applied the patch in the upstream bug report and this has resolved the issue. The issue report above also indicates that the patch is already in Debian. Given development upstream has slowed significantly and there haven't been any new releases for some time, I suggest Gentoo include this patch in the tree for our opendmarc builds. I am using opendmarc-1.4.1.1-r5.ebuild but the same problem will affect both ebuilds in the tree.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=00e2b5b66dfbd80001a280ef9e3c066903d70ffb commit 00e2b5b66dfbd80001a280ef9e3c066903d70ffb Author: Fabian Groffen <grobian@gentoo.org> AuthorDate: 2024-01-26 20:20:48 +0000 Commit: Fabian Groffen <grobian@gentoo.org> CommitDate: 2024-01-26 20:21:43 +0000 mail-filter/opendmarc-1.4.1.1-r6: add patch for arc-seal headers crash Closes: https://bugs.gentoo.org/900521 Signed-off-by: Fabian Groffen <grobian@gentoo.org> .../files/opendmarc-1.4.1.1-arc-seal-crash.patch | 38 ++++++++++++++++++++++ ...4.1.1-r4.ebuild => opendmarc-1.4.1.1-r6.ebuild} | 7 ++-- 2 files changed, 42 insertions(+), 3 deletions(-)