Beginning March 2nd, 2020 the Mailing Lists functionality on RootsWeb will be discontinued. Users will no longer be able to send outgoing emails or accept incoming emails. Additionally, administration tools will no longer be available to list administrators and mailing lists will be put into an archival state. Administrators may save the emails in their list prior to March 2nd. After that, mailing list archives will remain available and searchable on RootsWeb. - source
If you are already a frequent user, this will come as sad news. If you are not familiar with the Rootsweb lists yet, visit their index page to see the wealth of information there and know that these are discussions that will cease soon. If you see a list where you want to collaborate, you better get a move on. Effective March 2, they will no longer be interactive.
WCGS member, George Thomas, sees this as a huge loss and encourages all Wake County and North Carolina researchers that wish to have "your thoughts recorded (and searchable) on the rootsweb lists", to act fast.
Your only chance is between now and between now and March 2. After that, mailing list archives will remain available and searchable on RootsWeb.