Contents

Introduction

Commands

Extensions

Related Information

Introduction

This document describes the available SMTP/ESMTP commands and extensions on the Secure Email Gateway (formerly known as the Email Security Appliance). If a command or extension is not listed here, or if you wish to obtain additional details, please reach out to Cisco TAC.

Commands

These are a few available commands on Secure Email Gateway:

- DATA

- EHLO

- HELO

- HELP

- MAIL FROM

- NOOP

- QUIT

- RCPT TO

- RSET

- VRFY

Extensions

Listed here are a few available extensions on Secure Email Gateway:

- 8BITMIME

- AUTH

- SIZE

- SMTPUTF8 (AsyncOS 14.0 and newer)

- STARTTLS

Related Information

- Cisco Secure Email Gateway - End-User Guides

- Cisco Secure Email Gateway - Technical Support and Documentation