add X-Spam / X-Spamd / X-Rspamd headers

[f0lkert]

hello,

when the rspamd milter_headers module is configured to add headers to all scanned messages, like this:

extended_spam_headers = true;
use = ["add-headers", "x-spam-status", "x-spamd-result", "x-rspamd-server",  "x-rspam-action" ];

the filter-rspamd filter does not pass on the additional headers to smtpd.

this PR fixes that, alas likely not in the proper way. I have merely extended the hdrs literal with the variousX-Spam-* X-Spamd-* and X-Rspamd-* headers, hence those get processed the same way as the ARC-* headers.

this patch has only been tested on my own systems and might well have some hidden side effects i am not aware of. it does, however, now successfully pipe through all headers added by rspamd to smtpd.

please let me know if you have any concerns with this approach!

thank you for your contributions to the smtpd stack! =)

[dlatchx]

Doesn't #52 achieve the same thing?
It should be more generic

[f0lkert]

Doesn't #52 achieve the same thing? It should be more generic

hehe yes indeed, i only noticed that PR when i had already hacked together a quick fix...

PR #52 works fine on my site as well, so please ignore my PR #53. I would recommend to merge #PR 52 instead, so that the opensmtpd-filter-rspamd package will pass on the rspam headers to smtpd.

many thanks!
/f