CVS commit by mutz: 

Fix #89118 (Kmail does not respond correctly to "550" from smtp server)
CCBUG: 89118


  M +2 -0      smtp.cc   1.143.2.1


--- kdebase/kioslave/smtp/smtp.cc  #1.143:1.143.2.1
@@ -334,4 +334,6 @@ bool SMTPProtocol::executeQueuedCommands
       return false;
     }
+    if ( ts->failed() )
+      break;
     if ( cmdline.isEmpty() )
       continue;