def list=[ "abc" , "def" , "xyz" , "pqr" ]
def branches = [:]
def listLength=list.size()

for (i=0;i<listLength;i++) {
    def excl = list.get(i);
    branches[excl]={
        node (){
        	sh """echo hello $excl"""
        	scm
        	sh " ant build.xml"
        	mail

        }
    }
}

try {
    parallel branches
} catch(err) {
    print err
    <GET_PARALLEL_BRANCH_NAME/FAILURE_DETAILS>
}