is there any good way to get Sendmail not to call a milter for mail from particular addresses
I don't think so. But there is a way to get a milter to stop processing if the mail is coming from particular addresses. Of course, the milter has to have that functionality in the first place.
In the case of MIMEDefang, you can enable the filter_sender function and use the ACCEPT_AND_NO_MORE_FILTERING action. The IP address and HELO string of the sending system are available in this function as well, so you can tie those together for tighter whitelists. See www.mimedefang.org, the mimedefang-filter man page, and the MD mailing list for more info.
Kelson Vibber
SpeedGate Communications <www.speed.net>
