CVS commit by mutz: 

From KDE_3_3_BRANCH: Fix #89118 (Kmail does not respond correctly to "550" from smtp server)
CCBUG: 89118


  M +2 -0      smtp.cc   1.146


--- kdebase/kioslave/smtp/smtp.cc  #1.145:1.146
@@ -364,4 +364,6 @@ bool SMTPProtocol::executeQueuedCommands
       return false;
     }
+    if ( ts->failed() )
+      break;
     if ( cmdline.isEmpty() )
       continue;