email - smtp connection with c# not working -

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In my project I need to send mail to the customer. I am trying to do this with achieving the errors of SMTP. Please help me

Enter the code here 

  MailMessage Mail = New MailMessage (); Mail.Subject = "Topic"; similarity. Body = "sample mail"; Mail.From = New System.Net.Mail.MailAddress ("mymailID@gmail.com"); Mail.IsBodyHtml = Incorrect; Mail.BodyEncoding = System.Text.Encoding.Unicode; Mail.SubjectEncoding = System.Text.Encoding.Unicode; Mail.To.Add ("myFriendmailID@gmail.com"); Network credential cred = new network credentials ("mymailid@gmail.com", "mypassword"); SmtpClient smtp = new SmtpClient ("smtp.gmail.com"); Smtp.UseDefaultCredentials = false; Smtp.EnableSsl = true; Smtp.Credentials = cred; Smtp.Port = 587; Smtp.Send (mail);

error message "No connection can be made because the target machine has actively rejected it 74.125.130.109:" 87 "

< / Html>

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