email notification works once per services restart

Hi,

 

using 11d on Windows 2000 Server.  Was working well for a while.  I already tried repair database.

Test emails always work.

 

Job email alerts works once, then I have to restart the services, it will works once again until I restart them again... and so on...

 

I checked services credentials -no problems, also no errors generated.

 

Any help greatly appreciated.