C# 发送邮件例程

using System;
using System.Net.Mail;
using System.IO;
/// <summary>
/// Utilities 的摘要说明
/// </summary>
public static class Utilities
{
static Utilities()
{
//
// TODO: 在此处添加构造函数逻辑
//
}

//读取指定URL地址的HTML，用来以后发送网页用
public static string ScreenScrapeHtml(string url)
{
StreamReader reader = new StreamReader(System.Net.WebRequest.Create(url).GetResponse().GetResponseStream());
string str = reader.ReadToEnd();
reader.Close();
return str;
}

/// <summary>
/// 发送邮件
/// </summary>
/// <param name= "server "> smtp地址 </param>
/// <param name= "username "> 用户名 </param>
/// <param name= "password "> 密码 </param>
/// <param name= "from "> 发信人地址 </param>
/// <param name= "to "> 收信人地址 </param>
/// <param name= "subject "> 邮件标题 </param>
/// <param name= "body "> 邮件正文 </param>
/// <param name= "IsHtml "> 是否是HTML格式的邮件 </param>
public static void SendMail(string from,string to,string subject,string body,string server,string username,string password,bool IsHtml)
{
//设置SMTP 验证
SmtpClient mailClient =new SmtpClient(SiteConfiguration.MailServer);

//表示当前登陆用户的默认凭据进行身份验证，并且包含用户名密码
mailClient.UseDefaultCredentials = true;
mailClient.Credentials = new System.Net.NetworkCredential(username, password);

//指定如何发送电子邮件。
//Network 电子邮件通过网络发送到 SMTP 服务器。
//PickupDirectoryFromIis 将电子邮件复制到挑选目录，然后通过本地 Internet 信息服务 (IIS) 传送。
//SpecifiedPickupDirectory 将电子邮件复制到 SmtpClient.PickupDirectoryLocation 属性指定的目录，然后由外部应用程序传送。

client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;

//创建邮件对象
MailMessage mailMessage =new MailMessage(from,to,subject,body);

//定义邮件正文，主题的编码方式
mailMessage.BodyEncoding =System.Text.Encoding.GetEncoding("gb2312");
mailMessage.SubjectEncoding=System.Text.Encoding.GetEncoding("gb2312");

//获取或者设置一个值，该值表示电子邮件正文是否为HTML
mailMessage.IsBodyHtml = IsHtml;

//指定邮件的优先级
mailMessage.Priority = MailPriority.Normal;

/*
// //添加附件
//System.Web.Mail.MailAttachment mailAttachment=new System.Web.Mail.MailAttachment(@ "f:/att.txt ");
if (strFileName != " " && strFileName != null)
{
Attachment data = new Attachment(strFileName);
mailMessage.Attachments.Add(data);
}
*/

//发件人身份验证,否则163 发不了
client.Credentials = new System.Net.NetworkCredential(strFrom, Password);

//发送
mailClient.Send(mailMessage);
}

//发送plaintxt
public static void SendText(string from, string to, string subject, string body, string server, string username, string password)
{
SendMail(from, to, server, username, password, false);
}

//发送HTML内容
public static void SendHtml(string from, string to, string subject, string body, string server, string username, string password)
{
SendMail(from, to, server, username, password, true);
}

//发送制定网页
public static void SendWebUrl(string from, string to, string subject, string body, string server, string username, string password,string url)
{
//发送制定网页
SendHtml(from, to, subject, ScreenScrapeHtml(url), server, username, password);

}
}