Pleace help me to unsubscribe.

Good Day. Sorry for this stupid question. I can not to unsubscribe from this list. I tried to send letter to majordomo@network.cz with "unsubscribe bird-users" text in the body and in the subject but no results. How to unsubscribe bird-users ? My give up :) -- Anton [WARM-RIPE] Stack ltd division head tel. 8 (3822) 555-797