I am having an issue running dk-filter. I am using RHEL3 with Sendmail 8.14.3. About 10% messages with DomainKeys headers report failures:
SSL error:04077068:rsa routines:RSA_verify:bad signature
After checking each failed message, it appears that they all have one thing in common: another Milter has changed the Subject: line to something like this:
Subject: [SPAM] This is the subject text
I think this is causing the verify failures, but I am not sure how remedy this problem.