First of all a huge thank you to the mailcow-team. This is a really awesome opensource email stack. Also the UI is quite user friendly and straight forward. Keep going!
I got a cumbersome spamming issue. My email box gets flooded but rspamd doesn’t really filter them aggressive enough. The source domains and IPs are alternating. IP blocking and domain filtering was not successfully. The only stable pattern I found is the email subject. See below:

I tried to add a regex filter through the mailcow UI “Global filter maps” but there seems no filter map available for email subject. After digging I found a subject map in the rspamd-mailcow config with help of this post & config file:
=> rspamd/rspamddiscussions/4582
=> ./data/conf/rspamd/local.d/multimap.conf
It seems the only subject filter provided is a built-in filter list maintained by the mailcow-team itself and not accessable throuh mailcow UI:
BAD_SUBJECT_00 {
type = "header";
header = "subject";
regexp = true;
map = "http://fuzzy.mailcow.email/bad-subject-regex.txt";
score = 6.0;
symbols_set = ["BAD_SUBJECT_00"];
}
I don’t want to change config files managed by mailcow. This increases maintenance effort for each upgrade.
Does any one have an idea on how to address this issue the best?