config redirect
        option src 'wan'
        option proto 'tcpudp'
        option dest 'wan'
        option dest_ip '158.39.125.172'
        option dest_port '587'
        option src_dip '79.160.232.231'
        option target 'DNAT'
        option _name 'SMTP2'

config redirect
        option target 'SNAT'
        option dest 'wan'
        option name 'SMTP'
        option proto 'tcp udp'
        option src 'wan'
        option dest_ip '158.39.125.172'
        option dest_port '587'
        option src_dip '79.160.232.231'