System.Net.Mail是作为System.Web.Mail的替代来发送EMAIL.

System.Net.Mail

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private void SendMailByNet(){
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MailMessage objMailMessage = new MailMessage();
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objMailMessage.From=new MailAddress("UserFromMail");
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objMailMessage.To.Add(new MailAddress("UserToMail"));
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objMailMessage.BodyEncoding = System.Text.Encoding.UTF8;
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objMailMessage.Subject = "This is test";
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objMailMessage.Body = "Hi,Pippo

This is testing Email.";
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objMailMessage.IsBodyHtml = true;
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SmtpClient objSmtpClient = new SmtpClient();
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objSmtpClient.Host = "SMTP";
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objSmtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
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objSmtpClient.Credentials = new System.Net.NetworkCredential("UserFromMail","PWD");
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//objSmtpClient.EnableSsl = true;//SMTP 服务器要求安全连接需要设置此属性
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try
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{
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objSmtpClient.Send(objMailMessage);
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}
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catch (Exception ex)
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{
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Response.Write(ex.Message);
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}
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}

System.Web.Mail

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private void SendMailByWeb()
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{
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MailMessage objMailMessage = new MailMessage();
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SmtpMail.SmtpServer = System.Configuration.ConfigurationManager.AppSettings["SMTP"];
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objMailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");
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objMailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", System.Configuration.ConfigurationManager.AppSettings["FROM"]);
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//objMailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", System.Configuration.ConfigurationManager.AppSettings["PWD"]);//密码可以不提供
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objMailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpusessl", "true");//SMTP 服务器要求安全连接需要设置此属性
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objMailMessage.BodyEncoding = System.Text.Encoding.UTF8;
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objMailMessage.From = System.Configuration.ConfigurationManager.AppSettings["FROM"];
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objMailMessage.To = "UserToMail";
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objMailMessage.Subject = "this is test";
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objMailMessage.Body = "Hi Pippo,
This is testing EMAIL.";
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objMailMessage.BodyFormat = MailFormat.Html;
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try
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{
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SmtpMail.Send(objMailMessage);
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}
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catch (Exception ex)
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{
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Response.Write(ex.Message);
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}
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}

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System.Net.Mail和System.Web.Mail

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