What settings need to be changed in "main.cf"? Authentication-Results: domainkeys=softfail, dkim=softfail I'm noticing that a lot of spam getting through has softfails in the Authentication Results in the header. Is it possible to have this mail rejected? Also, what does "SPAM dsn cutoff level" mean? Wish there was a tooltip actually explaining this settings. Have been looking online all over just to figure this out.