Dictionary<string,List<string>> 타입 첫 번째 Value만 추출하기
{ "EmailList": { "www.fnffn.com": [ "b69aa3080a29384e63f6b67002031560-15705007@contact.gandi.net", "admin@www.fnffn.com", "administrator@www.fnffn.com", "hostmaster@www.fnffn.com", "postmaster@www.fnffn.com", "webmaster@www.fnffn.com", "admin@fnffn.com", "administrator@fnffn.com", "hostmaster@fnffn.com", "postmaster@fnffn.com", "webmaster@fnffn.com" ], "test.fnffn.com": [ "b69aa3080a29384e63f6b6..