ZyXEL Communications UAG Series - Chapter 18 SMTP Redirect; 18.2 SMTP Redirect Commands

UAG CLI Reference Guide 126
CHAPTER 18
SMTP Redirect
This chapter shows you how to configure SMTP redirection on your UAG.
18.1 SMTP Redirect Overview
SMTP redirect forwards the authenticated client’s SMTP message to a SMTP server, that handles all
outgoing e-mail messages. The UAG forwards SMTP traffic using TCP port 25.
18.1.1 SMTP
Simple Mail Transfer Protocol (SMTP) is the Internet’s message transport standard. It controls the
sending of e-mail messages between servers. E-mail clients (also called e-mail applications) then
use mail server protocols such as POP (Post Office Protocol) or IMAP (Internet Message Access
Protocol) to retrieve e-mail. E-mail clients also generally use SMTP to send messages to a mail
server. The older POP2 requires SMTP for sending messages while the newer POP3 can be used with
or without it. This is why many e-mail applications require you to specify both the SMTP server and
the POP or IMAP server (even though they may actually be the same server).
18.2 SMTP Redirect Commands
The following table identifies the values required for many of these commands. Other input values
are discussed with the corresponding commands.
Table 70 Input Values for SMTP Redirect Commands
LABEL DESCRIPTION
interface_name The name of the interface.
See Table 24 on page 70 for detailed information about the interface name.
domain_name Fully-qualified domain name. You may use up to 254 alphanumeric characters, dashes
(-), or periods (.), but the first character must be alphanumeric.
address_object The name of an IP address (group) object. You may use 1-31 alphanumeric characters,
underscores(_), or dashes (-), but the first character cannot be a number. This value is
case-sensitive.
user_name The name of a user (group). You may use 1-31 alphanumeric characters,
underscores(_), or dashes (-), but the first character cannot be a number. This value is
case-sensitive.