SMTP inspection in Firewall/IPS issue


SMTP inspection feature in Firewall/IPS may cause email not delivery smoothly, it is advised to disable this feature, at least in the internal/cross-board firewall/IPS.
 
Reference:
 
SMTP and ESMTP Connections Inspection with Cisco IOS Firewall Configuration Example
http://www.cisco.com/en/US/products/sw/secursw/ps1018/products_configuration_example09186a008064730a.shtml
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