User Guide

22-3
AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide
Chapter 22 Validating Recipients Using an SMTP Server
How to Validate Recipients Using an External SMTP Server
How to Validate Recipients Using an External SMTP Server
Related Topics
• Configuring the Call-Ahead Server Profile, page 22-3
Configuring the Call-Ahead Server Profile
When you configure the SMTP Call-Ahead Server Profile, you specify the settings that determine how
the Email Security appliance connects with the SMTP server and how it interprets the responses sent
back from the SMTP server.
Procedure
Step 1 Click Network > SMTP Call-Ahead.
Step 2 Click Add Profile.
Step 3 Enter the settings for the profile. For more information, see Table 22-2SMTP Call-Ahead Server Profile
Settings, page 22-4.
Step 4 Configure the advanced settings for the profile. For more information, see Table 22-3SMTP Call-Ahead
Server Profile Advanced Settings, page 22-5.
Step 5 Submit and commit your changes.
Related Topics
• SMTP Call-Ahead Server Profile Settings, page 22-3
• Call Ahead Server Responses, page 22-5
SMTP Call-Ahead Server Profile Settings
When you configure the SMTP Call-Ahead Server Profile, you need to configure settings that determine
how the Email Security appliance connects with the SMTP server.
Table 22-1 How to Validate Recipients Using an External SMTP Server
Do This More Info
Step 1
Determine how the appliance connects to the
SMTP server and interprets the server’s
responses.
Confi
g
urin
g
the Call-Ahead Server Profile,
pa
Step 2
Configure a public listener to use the SMTP
server to validate recipients
Enablin
g
a Listener to Validate Incomin
g
Mai
SMTP Server, page 22-6
Step 3
(Optional) Update your LDAP Routing query
to determine the SMTP server to use when
routing mail to a different host.
Confi
g
urin
g
LDAP Routin
g
Quer
y
Settin
g
s,
p
Step 4
(Optional) Configure the appliance to bypass
call-ahead validation for certain recipients
B
yp
assin
g
SMTP Call-Ahead Validation for C
e
or Groups, page 22-8