PF, The OpenBSD Packet Filter: Building The Network You Need: BSDCan, Ottawa, June 10th 2015
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Anchors - tag and quick

quick with tags

anchor "dmz" on $dmz_if {
        pass in proto { tcp udp } to $nameservers port domain tag GOOD
	pass in proto tcp to $webservers port { www https } tag GOOD
	pass in proto tcp to $mailserver port smtp tag GOOD
	pass in log (all, to pflog1) in proto tcp from $mailserver 
                to any port smtp tag GOOD
	block log quick ! tagged GOOD
	}