problem in mail sending

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ASP.NET

hi
i m sending mail from asp.net its working very fine to rediffmail and yahoo but on gmail mail is not sending

my code is:-

public string sendMail1(string tomail, string id, string body1)
       {
           MailMessage mail = new MailMessage();

           mail.To.Add(tomail);
           mail.From = new MailAddress(mfrommail);
           mail.Subject = "Verification Mail ";



           mail.Body = body1;
           mail.IsBodyHtml = true;
           mail.Priority = MailPriority.High;
           SmtpClient smtp = new SmtpClient();


           smtp.Host = "mail.myservername.com";
           smtp.Port = 25;
           smtp.EnableSsl = false;

           smtp.UseDefaultCredentials = false;
           smtp.Credentials = new System.Net.NetworkCredential(mfrommail, mSenderCredentials);


           smtp.Send(mail);

           return script;
       }