Both CW Skimmer and Skimmer Server have built-in protection against self-spotting, so long as you enter your callsign on the Operator tab in either GUI. Because of the change in the design of RTTY Skimmer Server, this easy solution is not available. Happily, there are two quick and easy solutions:
1. Enter your own call in the Bad Call list on the Filters tab of the Aggregator.
2. Add your call to the black.lst text file found in C:\Users\[your login]\Appdata\Roaming\Afreet\Reference\
Better safe than otherwise.
73, Pete N4ZR