[WP] (csbackntfy): only use login mechanism if username is set

csbackntfy.py

@@ -329,10 +329,9 @@ def main(argv=None):
 
         if 0 == len(host):
           raise Usage("Hostname missing.", eCodes.GLOBAL_UsageError)
-        if 0 == len(username):
-          raise Usage("Username missing.", eCodes.GLOBAL_UsageError)
-        if 0 == len(password):
-          raise Usage("Password missing.", eCodes.GLOBAL_UsageError)
+        if 0 != len(username):
+          if 0 == len(password):
+            raise Usage("Password missing.", eCodes.GLOBAL_UsageError)
         if -1 == port:
           raise Usage("Port missing.", eCodes.GLOBAL_UsageError)
       # prepare email
@@ -400,7 +399,8 @@ def main(argv=None):
           if useTLS:
             session.starttls()
             session.ehlo()
-          session.login(username, password)
+          if 0 != len(username):
+            session.login(username, password)
           session.sendmail(sender, receivers, mail.as_string())
         except smtplib.SMTPRecipientsRefused:
           session.quit()