Found by Findbugs:
Found by Findbugs:

WMI: Method org.apache.commons.mail.Email.setHeaders(java.util.Map)
     makes inefficient use of keySet iterator instead of entrySet
     iterator



git-svn-id: 821da8aee58e30b7d4c6085e5bc85eaed807bb40@240037 13f79535-47bb-0310-9956-ffa450edef68

mohanaraosv/commons-email,apache/commons-email,mohanaraosv/commons-email,apache/commons-email,apache/commons-email,mohanaraosv/commons-email