pass in proto tcp from any port > 1024 to any port = 25 with not short
pass in proto tcp from any port > 1024 to any port = 25
block in proto tcp from any to any with short
block in proto tcp from any to any with frag
pass in proto udp from any port = 53 to any port = 53
block in proto udp from any port = 53 to any port = 53 with not short