Cisco Pix blocks SMTP traffic with it’s ESMTP Inspection feature!Comments (1)

Cisco Pix has by default enabled a feature called ESMTP inspection in its software. It will drop all packages if using Transport Layer Security (TLS) encryption for email communication.

In order to allow the e-mails with TLS enabled, disable the ESMTP inspection feature as this output shows:

pix(config)#policy-map global_policy
pix(config-pmap)#class inspection_default
pix(config-pmap-c)#no inspect esmtp


fredrik Feb 1, 2015 - 23:12

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