Email functionality is not working in server

hi,
Below code is working in our local. It is not working server. Code is below,
public static void MailToUser(string emailid, string body, string subjecttext)
{
System.Net.Mail.MailMessage myMail = new System.Net.Mail.MailMessage();
            myMail.Body = body;
            myMail.IsBodyHtml = true;
            myMail.Subject = subjecttext;
            myMail.Priority = System.Net.Mail.MailPriority.High;
            System.Net.Mail.MailAddress fromAddress = new System.Net.Mail.MailAddress("info@test.com");
            myMail.From = fromAddress;
&nbs ...