Cisco Cisco Web Security Appliance S160 Guía Del Usuario
Chapter 25 Configuring Network Settings
Configuring SMTP Relay Hosts
25-26
Cisco IronPort AsyncOS 7.0 for Web User Guide
OL-23079-01
Configuring SMTP Relay Hosts
AsyncOS periodically sends system-generated email messages, such as
notifications, alerts, and IronPort Customer Support requests. By default,
AsyncOS uses information listed in the MX record on your domain to send email.
However, if the appliance cannot directly reach the mail servers listed in the MX
record, you must configure at least one SMTP relay host on the appliance.
notifications, alerts, and IronPort Customer Support requests. By default,
AsyncOS uses information listed in the MX record on your domain to send email.
However, if the appliance cannot directly reach the mail servers listed in the MX
record, you must configure at least one SMTP relay host on the appliance.
You might want to configure an SMTP relay host in the following scenarios:
•
You want the system-generated emails to go to a non-local email address, and
port 25 is blocked to outside networks.
port 25 is blocked to outside networks.
•
Your mail servers do not allow direct port 25 traffic from internal hosts.
If no SMTP relay host is defined, AsyncOS delivers directly to the mail server for
each email address.
each email address.
Note
If the Web Security appliance cannot communicate with the mail servers listed in
the MX record or any of the configured SMTP relay hosts, it cannot send email
messages and it writes a message in the log files.
the MX record or any of the configured SMTP relay hosts, it cannot send email
messages and it writes a message in the log files.
You can configure one or more SMTP relay hosts. You might want to configure
multiple SMTP relay hosts for redundancy in case one system becomes
unavailable. When you configure multiple SMTP relay hosts, AsyncOS uses the
topmost available SMTP relay host. If an SMTP relay host is unavailable, it tries
to use the one below it in the list.
multiple SMTP relay hosts for redundancy in case one system becomes
unavailable. When you configure multiple SMTP relay hosts, AsyncOS uses the
topmost available SMTP relay host. If an SMTP relay host is unavailable, it tries
to use the one below it in the list.
You can configure the SMTP relay host from either the web interface or command
line interface:
line interface:
•
Web interface. Use the Network > Internal SMTP Relay page.
•
Command line interface. Use the
smtprelay
CLI command.
Configuring SMTP from the Web Interface
Use the Network > Internal SMTP Relay page.
To configure the SMTP relay host from the web interface: