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Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

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User Guide for AsyncOS 9.7 for Cisco Email Security Appliances
 
Chapter 7      Defining Which Hosts Are Allowed to Connect Using the Host Access Table (HAT)
  Verifying Senders
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.
Sender Verification and Logging
The following log entries provide an example of Sender Verification verdicts.
Related Topics
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Envelope Sender Verification
Malformed Envelope Senders:
Domain does not exist (NXDOMAIN):
Domain does not resolve (SERVFAIL):
# 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
Thu Aug 10 10:14:10 2006 Info: ICID 3248 Address: <user> sender rejected, envelope 
sender domain missing
Wed Aug  9 15:39:47 2006 Info: ICID 1424 Address: <user@domain.com> sender rejected, 
envelope sender domain does not exist
Wed Aug  9 15:44:27 2006 Info: ICID 1425 Address: <user@domain.com> sender rejected, 
envelope sender domain could not be resolved