HOW TO OPEN SMPT PORT -CISCO ASA 55005

1. NAT Means translate Many addresses to FEW Addresses
2. PAT Means translate many addresses to ONE Address.


ACCESSLIST
firewall(config)#access-list inbound permit tcp any interface outside eq smtp


APPLY ACCESSLIST ON THE OUTSIDE INTERFACE
firewall(config)#access-group inbound in interface outside


NAT AND PAT TRANSLATIONS ON THE OUTSIDE INTERFACE
firewall(config)#static (inside,outside) tcp interface smtp 10.0.1.1 smtp netmask 255.255.255.255