Why are my logs filling up with "Milter change: header..." entries?
Symptom: I am running MIMEDefang, but now I am getting a lot of messages in my syslog that look like this:
Milter change: header MIME-Version: from 1.0 to 1.0
Cause: It is actually the Milter engine of sendmail that is logging all those. To reduce the amount of logging, try putting this line:
in your sendmail.mc file and then re-generate your sendmail.cf.