We had a similar issue, don't know if it was resolved. (but since this might be an amavisd-new issue, try the amavisd-new mail group)
Try adding this to local.cf: add_header all Relay-Country _RELAYCOUNTRY_ -- Michael Scheidell, CTO Office: 561-999-5000 x 1259 Direct: 561-939-7259 Real time security alerts: http://www.secnap.com/news _________________________________________________________________________ This email has been scanned and certified safe by SpammerTrap(tm). For Information please see http://www.spammertrap.com _________________________________________________________________________