I am running Spamassassin from exim on a per email basis via exiscan-acl.
Stored in some file I have a list of ips that signify users whose email
should always be allowed through.
To prevent Spamassassin from filtering that email out as spam I wanted to
append
a header to each email with some message that Spamassassin would look for,
that way it would know that this message is allowed.
My solution was to do this using one of exim's ACL's, unfortunately
Spamassassin can't see the appended header.