Cisco Cisco Email Security Appliance C170 사용자 가이드

If you have configured your Cisco IronPort appliance to use a default domain or to specifically 
allow partial domains when sending or receiving email or if you have enabled address parsing 
(see “Customizing Listeners” in the Cisco IronPort AsyncOS for Email Advanced Configuration 
Guide) you may not be able to create, send, and receive an email with a missing or malformed 
domain.

Verify that the message is rejected.

Note that the SMTP code and response is the one you configured for the envelope sender verification 
settings for the THROTTLED mail flow policy.

To confirm that mail from the email address listed in the sender verification exception table is not subject 
to envelope sender verification:

Add the following address to the exception table with an “Allow” behavior: admin@zzzaaazzz.com

Commit your changes.

Open a Telnet session to your Cisco IronPort appliance.

Use SMTP commands to send a test message from the email address you entered in the sender 
verification exception table (admin@zzzaaazzz.com).

Verify that the message is accepted.

If you remove that email address from the sender verification exception table, mail from that sender will 
be rejected because the domain portion of the envelope sender is not DNS verified.

# telnet IP_address_of_IronPort_Appliance port

220 hostname ESMTP

helo example.com

250 hostname

mail from: admin

553 #5.5.4 Domain required for sender address

# telnet IP_address_of_IronPort_Appliance port

220 hostname ESMTP

helo example.com

250 hostname

mail from: admin@zzzaaazzz.com

250 sender <admin@zzzaaazzz.com> ok