Redirect based on subject line

[colson58]

I am VERY new to this and sadly, a newbie with Linux as well.

Situation: Want to redirect mail based on subject line to alternate site for mail encryption and delivery.

Problem: Not sure how to test and correct syntax. Test fails.

Header checks. Not sure which one to use (REDIRECT or FILTER) to redirect mail.
/^Subject: BILD TEST/ FILTER smtp:mailserver.domain.com
/^Subject: ZIX TEST/ REDIRECT smtp:mailserver.domain.com


TEST RESULTS
220 mail.domain.com
HELO my.mailserver.tld
MAIL FROM:<colson@domain>
RCPT TO:<recipient@domain>
DATA
From: colson@domain.com
To: recipient@csstars.com
Subject: ZIX TEST

Testing FW smtp

.

Quit

250 mail.domain.com
250 2.1.0 Ok
250 2.1.5 Ok
354 End data with <CR><LF>.<CR><LF>
250 2.0.0 Ok: queued as 884F51238FD
500 5.5.2 Error: bad syntax

221 2.0.0 Bye


Connection to host lost.

What does the above mean?

Thank you,
CO