Exchange 2013 Edge outgoing mail - Unable to get any delivery failure for incorrect email address

Hi,

Using exchange 2013 server using EDGE 2013 for outgoing email flow. We are not getting any delivery failure message notification when we sent an incorrect email address.

====== Edge server message tracking details====

ConnectorId             : EdgeSync - Default-First-Site-Name to Internet

Source                  : SMTP

EventId                 : FAIL

InternalMessageId       : 7683696492577

MessageId               : <1900e46b6fc246ce9305a3e9a235567b@servername.local>

Recipients              :{mraffi22222@xyz.com}

RecipientStatus         : {[{LRT=};{LED=550 #5.1.0 Address rejected.};{FQDN=};{IP=}]}

Any help? why no delivery failure for this incorrect email address?

MD