SimpleSendMessage.javaimportjava.util.*;importjavax.mail.*;importjavax.mail.internet.*;importjavax.activation.*;publicclassSimpleSendMessage{publicstaticvoidmain(String[]args){//Collectthenecessaryinformationtosendasimplemessage//Makesuretoreplacethevaluesforhost,to,andfromwith//validinformation.//h...