My email alerts stopped working. So I tried to set at cmd line. But
they will not set.

Expected result:
stsadm -o getproperty -propertyname job-immediate-alerts -url
http://moss
<Property Exist="No" />

stsadm -o setproperty -propertyname job-immediate-alerts -url
http://moss -propertyvalue "every 5 minu
tes between 0 and 59"
Operation completed successfully.

stsadm -o getproperty -propertyname job-immediate-alerts -url
http://moss
<Property Exist="Yes" Value="every 5 minutes between 0 and 59" />

My actual result is that on the check after a successful operation,
it still says <Property Exist="No" />

Does anyone have any idea what might be wrong that this property
won't set?