You must have to use Gmail ID as From Email ID. USE: using System.Net.Mail; // Namespace OnSendMail Button Click Event : try { SmtpClient obj = new SmtpClient(“smtp.gmail.com”); obj.Credentials = new System.Net.NetworkCredential(“your@gmail.com”, “password”); obj.Port = 587; obj.Host = “smtp.gmail.com”; obj.EnableSsl = true; MailMessage message = new MailMessage(“your@gmail.com”,”to@yahoo.com”); message.Subject = txtSUB.Text; // subject textbox’s text message.Body …
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