C#.net发送邮件

using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Mail;
using System.Net;
using System.Data;
using System.ComponentModel;

namespace ITTS_Express.Contact
{
public class MailHelper
{
//private static log4net.ILog log = log4net.LogManager.GetLogger(typeof(MailHelper));
/// <summary>
/// 發送郵件
/// </summary>
/// <param name="strFrom">收件人Email Address</param>
/// <param name="lstTo">發件人Email Address列表</param>
/// <param name="strSubject">郵件標題</param>
/// <param name="strBody">郵件内容</param>
/// <param name="isBodyHtml">是否是HTML格式</param>
/// <param name="strSmtpServer">SMTP 郵件服務器</param>
/// <param name="lstAttachment_FullPath">附件路徑列表</param>
/// <returns>是否發送成功</returns>
public static bool SendMail(string strFrom, List<string> lstTo, List<string> listCC, string strSubject,
string strBody, bool isBodyHtml, string strSmtpServer,
List<string> lstAttachment_FullPath, bool isAsync)
{
return SendMail(strFrom, lstTo, listCC, strSubject, strBody, isBodyHtml, strSmtpServer, null, null, lstAttachment_FullPath, isAsync);
}

/// <summary>
/// 發送郵件
/// </summary>
/// <param name="strFrom">收件人Email Address</param>
/// <param name="lstTo">發件人Email Address列表</param>
/// <param name="lstCC">抄送者Email地址</param>
/// <param name="strSubject">郵件標題</param>
/// <param name="strBody">郵件内容</param>
/// <param name="isBodyHtml">是否是HTML格式</param>
/// <param name="strSmtpServer">SMTP 郵件服務器</param>
/// <param name="strUserName">用戶名</param>
/// <param name="strPwd">密碼</param>
/// <param name="lstAttachment_FullPath">附件路徑列表</param>
/// <returns>是否發送成功</returns>
public static bool SendMail(string strFrom, List<string> lstTo, List<string> lstCC, string strSubject,
string strBody, bool isBodyHtml, string strSmtpServer,
string strUserName, string strPwd, List<string> lstAttachment_FullPath, bool isAsync)
{
#region ==== 创建电子邮件 ====

MailMessage myMail = new MailMessage();
//发件人
myMail.From = new MailAddress(strFrom);
//收件人
foreach (string item in lstTo)
myMail.To.Add(item);
if (lstCC != null && lstCC.Count > 0)
{
foreach (string item in lstCC)
myMail.CC.Add(item);
}
//主题
myMail.Subject = strSubject;
//内容
myMail.Body = strBody;
//正文编码
myMail.BodyEncoding = System.Text.Encoding.UTF8;
//设置为HTML格式
myMail.IsBodyHtml = isBodyHtml;
//优先级
myMail.Priority = MailPriority.Normal;
//发送附件
if (lstAttachment_FullPath != null && lstAttachment_FullPath.Count > 0)
{
foreach (string attachment_FullPath in lstAttachment_FullPath)
myMail.Attachments.Add(new Attachment(attachment_FullPath));
}

#endregion

#region ==== 配置支持Stmp协议的客户端 ====

SmtpClient smtpClient = new SmtpClient();
//发送方式
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
//smtp服务器
smtpClient.Host = strSmtpServer; //"smtp.sina.com", your smtp server here10.128.1.1
////用户名凭证
if (!string.IsNullOrEmpty(strUserName) && !string.IsNullOrEmpty(strPwd))
smtpClient.Credentials = new System.Net.NetworkCredential(strUserName, strPwd);

#endregion

bool isSuccess = true;
try
{
//发送邮件
if (isAsync)
{
smtpClient.SendCompleted += new SendCompletedEventHandler(SendMailCompleted);
smtpClient.SendAsync(myMail, myMail);
}
else
smtpClient.Send(myMail);

}
catch (Exception e)
{
isSuccess = false;
//log.Error(e.Message);
}
return isSuccess;
}

static void SendMailCompleted(object sender, AsyncCompletedEventArgs e)
{
MailMessage mailMsg = (MailMessage)e.UserState;
string subject = mailMsg.Subject as string;
if (e.Cancelled) // 邮件被取消
{
Console.WriteLine(MailAddressToString(mailMsg) + subject + " 被取消。");
Console.WriteLine(" 被取消。");
//log.Info(MailAddressToString(mailMsg) + subject + "被取消。");
}
if (e.Error != null)
{
Console.WriteLine("错误：" + e.Error.ToString());
//log.Warn("错误：" + e.Error.ToString());
}
else
{
Console.WriteLine(MailAddressToString(mailMsg) + "发送完成。");
//log.Info(MailAddressToString(mailMsg) + "发送完成。");
}
}

private static string MailAddressToString(MailMessage mailMsg)
{
StringBuilder sb = new StringBuilder();
foreach (MailAddress addr in mailMsg.To)
{
sb.Append(addr.Address + " ");
}
return sb.ToString();
}

}

}

备注：抄送者通常为企业主管的Email

第一个方法为邮件服务器不用校验用户名密码的，现在很少使用

通常调用第二个方法来发送邮件

你的邮箱需要开通企业邮箱服务功能，才能发送邮件，不同的邮件提供商的企业邮箱发送频率是有限制的！