According to the read... they were sending email, using RNC servers(govt related, don't know), but then an update was added -- they were later deleted.
Tom Blanton, director of the National Security Archive, a Washington-based government watchdog that requests and collects classified information, sued the Bush administration (along with CREW) over the RNC server and lost emails, and is still waiting to see what was in them.
“If s enior aides to President Trump were using private RNC servers on the afternoon after the inauguration, they have about 16 days to copy them into the official White House systems. If not, not they are in violation of the law,” he says.
This story was updated to state that the RNC has deleted the emails of Bannon, Kushner and Conway.
http://www.newsweek.com/trump-emails-rnc-reince-priebus-white-house-server-548191