Cisco Cisco Email Security Appliance C160 Mode D'Emploi
Chapter 5 Configuring the Gateway to Receive Email
5-70
Cisco IronPort AsyncOS 7.5 for Email Configuration Guide
OL-25136-01
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).
in the sender 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.
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.
Envelope Sender Verification
Malformed Envelope Senders:
Domain does not exist (NXDOMAIN):
# 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
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