<Target Name="AfterBuild">
 <Exec Command="curl -H "x-api-key:mykey"
 -d "deployment[application_id]=appId"
 -d "deployment[description]=MSbuild deploy using curl"
 -d "deployment[revision]=0"
 -d "deployment[changelog]=Deployed using MSBuild"
 -d "deployment[user]=User"
 -d http://api.newrelic.com/deployments.xml"/>
 </Target>
</project>

"Severity Code Description Project File Line Suppression State Error
The command "C:WINDOWSsystem32curl" exited with code 9009."