Cisco Cisco Email Security Appliance C160 Mode D'Emploi
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AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide
Chapter 7 Defining Which Hosts Are Allowed to Connect Using the Host Access Table (HAT)
Verifying Senders
Note that the SMTP code and response is the one you configured for the envelope sender verification
settings for the THROTTLED mail flow policy.
settings for the THROTTLED mail flow policy.
Sending a Message from an Address That is Excluded from Sender Verification Rules
To confirm that mail from the email address listed in the sender verification exception table is not subject
to envelope sender verification:
to envelope sender verification:
Procedure
Step 1
Add the following address to the exception table with an “Allow” behavior:
admin@zzzaaazzz.com
Step 2
Commit your changes.
Step 3
Open a Telnet session to your appliance.
Step 4
Use SMTP commands to send a test message from the email address you entered in the sender
verification exception table (admin@zzzaaazzz.com).
verification exception table (admin@zzzaaazzz.com).
Step 5
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.
be rejected because the domain portion of the envelope sender is not DNS verified.
Sender Verification and Logging
The following log entries provide an example of Sender Verification verdicts.
Related Topics
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mail from: admin
553 #5.5.4 Domain required for sender address
# telnet IP_address_of_Email_Security_Appliance port
220 hostname ESMTP
helo example.com
250 hostname
mail from: admin@zzzaaazzz.com
250 sender <admin@zzzaaazzz.com> ok