CASE(HELO_NAME, helo_name)
CASE(QUEUE_ID, queue_id)
CASE(SENDER, sender)
+ CASE(SENDER_DOMAIN, sender_domain)
CASE(RECIPIENT, recipient)
+ CASE(RECIPIENT_DOMAIN, recipient_domain)
CASE(RECIPIENT_COUNT, recipient_count)
CASE(CLIENT_ADDRESS, client_address)
CASE(CLIENT_NAME, client_name)