What ever it means, it at least means "trouble" -- Send the customer a separate email explaining that it occurred as a result of recent list-distributions. Ask them if they are aware of any problems. Depending upon the (automated?) response, act appropriately. At 04:46 03/04/1999 Thursday -0500, you wrote: |Lately I have been getting the error msg.: | |550 System resources error: 104 | |from some hotmail addresses. Anybody know what this means? Unknown |user, over quota, ...?