PF, The OpenBSD Packet Filter: Building The Network You Need: BSDCan, Ottawa, June 10th 2015
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Single NAT, Web & Mail Server On The Inside: From The Inside

Pre-4.7:

rdr on $int_if proto tcp from $int_if:network to $ext_if \
       port $webports -> $webserver
rdr on $int_if proto tcp from $int_if:network to $ext_if \
       port $email -> $emailserver
no nat on $int_if proto tcp from $int_if to $int_if:network
nat on $int_if proto tcp from $int_if:network to $webserver \
       port $webports -> $int_if 
nat on $int_if proto tcp from $int_if:network to $emailserver \
       port $email -> $int_if