howto stop 1 users outgong mail from being scanned & headers changed

[Dan Carl]

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I have a user named "mailer" that I use to send  bulk emails.
I don't want Mailscanner to scan or change headers on any of its outgoing
mail.
I made a virus.scanning.rules listed below.
From:   mailer at mydomain.com        no
FromOrTo:    default                 yes

and a signing rule as follows
From:   mailer at mydomain.com        no
FromOrTo:    default                 yes

When I send emails they are still sent via Mailscanner

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