The mailing list for listmasters using Sympa

["Mail administrator, Otto Makela" <address@concealed>]

Setup: RHEL8 server with rpm-installed Sympa.

I've been trying to run our mailing list server so that SPF and DKIM
rules get followed in the "classic" way. Our mailing list has the
SPF permission for its Sender address, and we try to pass the message
through unmolested, so the original DKIM signatures verify.

Yes, I know Sympa supports and many admins prefer rewriting mailing
list messages and re-signing them with the mailing list server DKIM key,
but this minimally intrusive way is the way I'd prefer to do things.

However, the default seems to be for custom_subject (with the list name)
to be enabled for new mailing lists. As far as I can figure out, there
is no system-wide parameter to disable this default, and have edited the
relevant .tt2 files at /usr/share/sympa/default/create_list_templates to
try to remove this for newly created lists.

I now suspect I've been bitten by having this setting added back to
the .tt2 files with a Sympa version update to 6.2.78 on 2026-04-01:
I could not find a trace of the changes I had made (like .rpmold files),
and mailing lists created after this date had custom_subject enabled.

Is there a way to have a system-wide default setting for .tt2 files to
determine if this parameter (which after all will break DKIM signatures)
should be on by default for new mailing lists? And/or should the
installation rpm package be adjusted to preserve .tt2 file changes?

--
address@concealed (Mail Administrator, Otto J. Makela)