.net2.0 发送邮件示例代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
//添加的命名空间引用
using System.Text.RegularExpressions;
using System.Net;
using System.Net.Mail;

namespace SendEmail
{
public class Send
{
/// <summary>
/// 发送邮件
/// </summary>
/// <param name="fromEmail">发送者邮箱地址</param>
/// <param name="fromPsaaWord">发送者邮箱密码</param>
/// <param name="toEmail">收件人邮箱地址</param>
/// <param name="subject">邮件主题</param>
/// <param name="body">邮件主要内容</param>
/// <param name="attachmentsPath">邮件附件(无附件时为null)</param>
/// <returns>发送成功返回true,失败false</returns>
public bool SendEmail(string fromEmail, string fromPsaaWord, string toEmail, string subject, string body, string[] attachmentsPath)
{
bool Success = true;
System.Text.StringBuilder errorMsg = new System.Text.StringBuilder();
if (!Regex.IsMatch(fromEmail, @"^\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$"))
{
errorMsg.Append("参数fromEmail格式不正确!");
Success = false;
}
if (!Regex.IsMatch(toEmail, @"^\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$"))
{
errorMsg.Append("参数toEmail格式不正确!");
Success = false;
}
if (subject.Trim() == "")
{
errorMsg.Append("不支持无主题的邮件!");
Success = false;
}
if (body.Trim() == "")
{
errorMsg.Append("不支持无内容的邮件!");
Success = false;
}
try
{
SendReady(fromEmail, fromPsaaWord, toEmail, subject, body, attachmentsPath);
}
catch (Exception err)
{
Success = false;
throw new Exception(errorMsg.ToString() + err);
}
return Success;
}

public void SendReady(string fromEmail, string fromPsaaWord, string toEmail, string subject, string body, string[] attachmentsPath)
{
//验证合法邮箱的表达式,正确时返回true
if (!Regex.IsMatch(fromEmail, @"^\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$"))
{
//邮箱不合法
}
//发件人地址
MailAddress from = new MailAddress(fromEmail);
//收件人地址
MailAddress to = new MailAddress(toEmail);
//邮件主题、内容
MailMessage message = new MailMessage(from, to);
//主题
message.Subject = subject;
message.SubjectEncoding = System.Text.Encoding.UTF8;
//内容
message.Body = body;
message.BodyEncoding = System.Text.Encoding.UTF8;
//在有附件的情况下添加附件
try
{
if (attachmentsPath != null && attachmentsPath.Length > 0)
{
Attachment attachFile = null;
foreach (string path in attachmentsPath)
{
attachFile = new Attachment(path);
message.Attachments.Add(attachFile);
}
}
}
catch (Exception err)
{
throw new Exception("在添加附件时有错误:" + err);
}
try
{
//大部分邮件服务器均加smtp.前缀
SmtpClient client = new SmtpClient("smtp." + from.Host);
SendMail(client, from, fromPsaaWord, to, message);
}
catch (SmtpException err)
{
//如果错误原因是没有找到服务器，则尝试不加smtp.前缀的服务器
if (err.StatusCode == SmtpStatusCode.GeneralFailure)
{
try
{
//有些邮件服务器不加smtp.前缀
SmtpClient client = new SmtpClient(from.Host);
SendMail(client, from, fromPsaaWord, to, message);
}
catch (SmtpException)
{ }
}
else
{ }
}
}
//根据指定的参数发送邮件
public void SendMail(SmtpClient client, MailAddress from, string password, MailAddress to, MailMessage message)
{
//不使用默认凭证,注意此句必须放在client.Credentials的上面
client.UseDefaultCredentials = false;
//指定用户名、密码
client.Credentials = new NetworkCredential(from.Address, password);
//邮件通过网络发送到服务器
client.DeliveryMethod = SmtpDeliveryMethod.Network;
try
{
client.Send(message);
}
catch
{
throw new Exception("系统繁忙,发送失败!");
}
finally
{
//及时释放占用的资源
message.Dispose();
}
}
}
}