用System.Web.Mail发送邮件，适用于.net1.1，.net2.0请用System.Net.Mail

先引用System.Web;

2.0引用System.Net; MailAttachment改成Attachment


1，发送简单邮件
[ C# ]
MailMessage mail = new MailMessage();
mail.To = "me@mycompany.com";
mail.From = "you@yourcompany.com";
mail.Subject = "this is a test email.";
mail.Body = "this is my test email body";
SmtpMail.SmtpServer = "localhost"; //your real server goes here
SmtpMail.Send( mail );

2,发送附件
[ C# ]
MailMessage mail = new MailMessage();
mail.To = "me@mycompany.com";
mail.From = "you@yourcompany.com";
mail.Subject = "this is a test email.";
mail.Body = "this is my test email body.";
MailAttachment attachment = new MailAttachment( Server.MapPath( "test.txt" ) );
mail.Attachments.Add( attachment );
SmtpMail.SmtpServer = "localhost"; //your real server goes here
SmtpMail.Send( mail );

3,发送给多人
[ C# ]
MailMessage mail = new MailMessage();
mail.To = "me@mycompany.com;him@hiscompany.com;her@hercompany.com";
mail.From = "you@yourcompany.com";
mail.Subject = "this is a test email.";
mail.Body = "this is my test email body.";
SmtpMail.SmtpServer = "localhost"; //your real server goes here
SmtpMail.Send( mail );


4，用需要Smtp验证的邮箱发信
现在为了防止垃圾邮件，绝大部分Smtp服务器需要验证了
发信方法如下：
[ C# ]
MailMessage mail = new MailMessage();
mail.To = "me@mycompany.com";
mail.From = "abc@126.com";
mail.Subject = "this is a test email.";
mail.Body = "Some text goes here";
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1"); //basic authentication

mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "abc"); //set your username here

mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "your password"); //set your password

here SmtpMail.SmtpServer = "smtp.126.com"; //your real server goes here
SmtpMail.Send( mail );


5,修改smtp服务器的端口，以及使用SSL加密大部分smtp服务器的端口是25，但有些却不是同时，绝大部分Smtp服务器不需要SSL登陆，有些却

需要比如Gmail，smtp端口是：465，同时支持SSL代码如下：
[ C# ]
MailMessage mail = new MailMessage();
mail.To = "me@mycompany.com";
mail.From = "abc@126.com";
mail.Subject = "this is a test email.";
mail.Body = "Some text goes here";
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1"); //basic authentication

mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "abc"); //set your username here

mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "your password"); //set your password here
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpserverport",465);
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpusessl", "true");
SmtpMail.SmtpServer = "smtp.126.com"; //your real server goes here
SmtpMail.Send( mail );

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