Federal Trademark Registration Issue
I registered a business in the state of CT ''IT Integrity, LLC'' 3-4 years ago and registered ''ITIntegrity dot com'' as a domain name. Recently someone in FL applied for and was granted a ''Federal Trademark'' for ''IT Integrity'' (Reg #3221865). I was using the name ''IT Integrity'' before they filed. I received a ''Cease and Desist Notification'' letter form a person, not an attorney, claiming I was am in violation of their trademark and must immediately stop using the domain name and transfer it to them. What course of action should I take, if any? Is it too late to contest the federal trademark?