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Chapter 7. Application Inspection > Extended Simple Mail Transfer Protocol

Extended Simple Mail Transfer Protocol

Cisco ASA Extended SMTP (ESMTP) inspection enhances the traditional SMTP inspection provided by Cisco PIX Firewall version 6.x or earlier. It provides protection against SMTP-based attacks by restricting the types of SMTP commands that can pass through the Cisco ASA. The following are the supported ESMTP commands:

  • AUTH

  • DATA

  • EHLO

  • ETRN

  • HELO

  • HELP

  • MAIL

  • NOOP

  • QUIT

  • RCPT

  • RSET

  • SAML

  • SEND

  • SOML

  • VRFY


  

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