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How do I test Bounce Verification on the ESA?
Document ID: 118466
Contributed by Jerry Orona and Enrico Werner, Cisco TAC Engineers.
Oct 09, 2014
Contents
Introduction
How do I test Bounce Verification on the ESA?
Introduction
This document describes how to test Bounce Verification (BV) on the Email Security Appliance (ESA).
How do I test Bounce Verification on the ESA?
AsyncOS defines bounces as mail with a null Mail From address (< >) or messages sent by
<MAILER−DAEMON@domain.com>.  To determine if BV is configured, you can send test messages with
null Mail From or MAILER−DAEMON@<domain.com> addresses through the ESA. Bounce Verification
sees the messages as 'untagged' bounces and processes them according to your configuration.
You can view test messages within the ESA mail logs or during a manual SMTP conversation:
Connecting to ESA using telnet
• 
telnet  esa.example.com 25
Trying 192.168.1.254...
Connected to esa.example.com.
Escape character is '^]'.
220 esa.example.com ESMTP
helo
250 esa.example.com
MAIL FROM command with null sender address
• 
mail from:
250 sender <> ok
rcpt to: testuers@example.com
550 #5.1.0 Rejected by bounce verification.
MAIL FROM command with MAILER−DEAMON@test.com
• 
mail from: MAILER−DAEMON@test.com
250 sender <MAILER−DAEMON@test.com> ok
rcpt to: testuser@example.com
550 #5.1.0 Rejected by bounce verification.
A remote source could spoof any MAILER−DAEMON@ address, but this message is viewed as an untagged
bounce by Bounce Verification, if the RCPT−TO address is not tagged with the Bounce Verification key
configured on the ESA.