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Cisco pix6/16/2023 ![]() These are: HELO, MAIL, RCPT, DATA, RSET, NOOP, and QUIT. Only the SMTP commands specified in RFC 821 section 4.5.1 are allowed on amail server. ![]() Bearingthis in mind, Cisco recommends placing mail servers on a DMZ interface and not on the inside network. MailGuard allows a mailserver to be deployed on a network protected by the PIX without it being exposedto known security problems with certain mail server implementations. MailGuard provides a mechanism to safeguard Simple Mail Transfer Protocol(SMTP) connections from the outside to an e-mail server. This section discusses the Attack Guards features put in place to mitigateattacks via e-mail Domain Name System (DNS) fragmentation authentication,authorization, and accounting (AAA) and SYN flooding.
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