A mailing list devoted entirely to Belarusian language support is available at be-locale@iatp.unibel.by. To subscribe, send a message to majordomo@iatp.unibel.by with the string "subscribe be-locale youremailaddress" in the body of the message
Another mailing list that treats mostly linguistic issues is available at movaznaustva@egroups.com. To subscribe to it, send a message with empty body to movaznaustva-subscribe@egroups.com.