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nat (outside, inside) source static any any destination static interface mail-server service obj-svc_mta obj-svc_mta unidirectional
nat (outside, inside) source static any any destination static interface mail-server service obj-svc_web obj-svc_web unidirectional
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access-list outside_access_in extended permit object obj-svc_mta any object-group mail-server log disable
access-list outside_access_in extended permit object obj-svc_web any object-group mail-server log disable
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object network mail-server
host <mail server ip>
object service tcp_smtp
service tcp destination 25
nat (outside, inside) source static any any destination static interface mail-server service tcp_smtp tcp_smtp unidirectional
nat (<incoming interface>,<outgoing interface>) source static <original source object> <translated source object> destination static <original destination object> <translated destination object> service <original service> <translated service> <(optional: unidirectional)>
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