Hello opensmtpd misc! I have a question about opensmtpd and rspamd. I'm using opensmtp and rspamd as a relay server with spam checking. The spam check is done with help of opensmtpd-filter-rspamd. The os is OpenBSD 7.0
I have noticed, that all DSN messages coming to or from internal mail server, are marked as spam, because rspamd adds BROKEN HEADERS for this messages. First of all, I tried to research this issue but with no luck, i've created this issue on rspamd github repo https://github.com/rspamd/rspamd/issues/3983 And we found that messages with "broken headers" have empty "mail from" header, where rspamd expect it as "<>" The patch to workaround this was added to rspamd side. But, is this correct behavior of "mail from" header? Maybe the header should have "<>" in it?
