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Cisco Bug: CSCuq22507 - Apply LDAP routing for bounced messages

Last Modified

Apr 24, 2017

Products (1)

  • Cisco Email Security Appliance

Known Affected Releases

10.0.1-087 8.0.1-113 8.5.6-074

Description (partial)

Our ESAs support many internal mail systems.  Some share the same sender email domain ( as well.  The ESAs currently bypass LDAP routing whenever they generate a bounce to an internal sender.  For example, consider the following message:    Sender: (sent from Math department server which sends all outgoing mail to the ESAs)

When the ESA tries to deliver this message, it will bounce because invaliduser@jhu.ed does not exist.  The ESA will then attempt to send the bounced email to  But when the ESA generates the bounce, it will bypass LDAP routing for and try to deliver to either the MX record or A record for, which in our environment will not work (no internal MX record and the A record is a web server).  This a problem because the ESAs will not know how to properly route the bounce to  We cannot use an smtp route for because not all mail is hosted on the same mail system.  We rely heavily on LDAP routing to get email to the proper mail server.
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