C# 发送邮件 SMTP

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Mail;
using System.Text;
using System.Threading.Tasks;

namespace WindowsFormsApplication1

{

//在使用 System.Net.Mail组建发送邮件的时候出现了"命令顺序不正确。服务器响应为: Error: need EHLO and AUTH first !"异常

//1. 需要开启 POP3/IMAP/SMTP/Exchange/CardDAV/CalDAV服务并且记住授权码

//2. 使用授权码(不要用qq邮箱登录密码)

//3.启用smtp.EnableSsl = true;

/// <summary>
/// Author : junlu
/// Date : :2017年12月21日
/// Description : 邮件发送辅助类
/// </summary>
public class EmailHelper
{
#region [ 属性(发送Email相关) ]
private string _SmtpHost = string.Empty;
private int _SmtpPort = -1;
private string _FromEmailAddress = string.Empty;
private string _FormEmailPassword = string.Empty;

/// <summary>
/// smtp 服务器
/// </summary>
public string SmtpHost
{
get
{
if (string.IsNullOrEmpty(_SmtpHost))
{
_SmtpHost = "smtp.qq.com"; //这里是qq服务器
}
return _SmtpHost;
}
}
/// <summary>
/// smtp 服务器端口默认为25
/// </summary>
public int SmtpPort
{
get
{
if (_SmtpPort == -1)
{
_SmtpPort = 25;
}
return _SmtpPort;
}
}
/// <summary>
/// 发送者 Eamil 地址
/// </summary>
public string FromEmailAddress
{
get
{
if (string.IsNullOrEmpty(_FromEmailAddress))
{
_FromEmailAddress = "123456789@qq.com";
}
return _FromEmailAddress;
}
}

/// <summary>
/// 发送者 Eamil 密码
/// </summary>
public string FormEmailPassword
{
get
{
if (string.IsNullOrEmpty(_FormEmailPassword))
{
_FormEmailPassword = " 授权码";
}
return _FormEmailPassword;
}
}
#endregion

#region [ 属性(邮件相关) ]
/// <summary>
/// 收件人 Email 列表，多个邮件地址之间用半角逗号分开
/// </summary>
public string ToList { get; set; }
/// <summary>
/// 邮件的抄送者，支持群发，多个邮件地址之间用半角逗号分开
/// </summary>
public string CCList { get; set; }
/// <summary>
/// 邮件的密送者，支持群发，多个邮件地址之间用半角逗号分开
/// </summary>
public string BccList { get; set; }
/// <summary>
/// 邮件标题
/// </summary>
public string Subject { get; set; }
/// <summary>
/// 邮件正文
/// </summary>
public string Body { get; set; }

private bool _IsBodyHtml = true;
/// <summary>
/// 邮件正文是否为Html格式
/// </summary>
public bool IsBodyHtml
{
get { return _IsBodyHtml; }
set { _IsBodyHtml = value; }
}
/// <summary>
/// 附件列表
/// </summary>
public List<Attachment> AttachmentList { get; set; }
#endregion

#region [ 构造函数 ]
/// <summary>
/// 构造函数 (body默认为html格式)
/// </summary>
/// <param name="toList">收件人列表</param>
/// <param name="subject">邮件标题</param>
/// <param name="body">邮件正文</param>
public EmailHelper(string toList, string subject, string body)
{
this.ToList = toList;
this.Subject = subject;
this.Body = body;
}
/// <summary>
/// 构造函数
/// </summary>
/// <param name="toList">收件人列表</param>
/// <param name="subject">邮件标题</param>
/// <param name="isBodyHtml">邮件正文是否为Html格式</param>
/// <param name="body">邮件正文</param>
public EmailHelper(string toList, string subject, bool isBodyHtml, string body)
{
this.ToList = toList;
this.Subject = subject;
this.IsBodyHtml = isBodyHtml;
this.Body = body;
}
/// <summary>
/// 构造函数
/// </summary>
/// <param name="toList">收件人列表</param>
/// <param name="ccList">抄送人列表</param>
/// <param name="bccList">密送人列表</param>
/// <param name="subject">邮件标题</param>
/// <param name="isBodyHtml">邮件正文是否为Html格式</param>
/// <param name="body">邮件正文</param>
public EmailHelper(string toList, string ccList, string bccList, string subject, bool isBodyHtml, string body)
{
this.ToList = toList;
this.CCList = ccList;
this.BccList = bccList;
this.Subject = subject;
this.IsBodyHtml = isBodyHtml;
this.Body = body;
}
/// <summary>
/// 构造函数
/// </summary>
/// <param name="toList">收件人列表</param>
/// <param name="ccList">抄送人列表</param>
/// <param name="bccList">密送人列表</param>
/// <param name="subject">邮件标题</param>
/// <param name="isBodyHtml">邮件正文是否为Html格式</param>
/// <param name="body">邮件正文</param>
/// <param name="attachmentList">附件列表</param>
public EmailHelper(string toList, string ccList, string bccList, string subject, bool isBodyHtml, string body, List<Attachment> attachmentList)
{
this.ToList = toList;
this.CCList = ccList;
this.BccList = bccList;
this.Subject = subject;
this.IsBodyHtml = isBodyHtml;
this.Body = body;
this.AttachmentList = attachmentList;
}
#endregion

#region [ 发送邮件 ]
/// <summary>
/// 发送邮件
/// </summary>
/// <returns></returns>
public void Send()
{
MailMessage mm = new MailMessage(); //实例化一个邮件类
SmtpClient smtp = new SmtpClient(); //实例化一个SmtpClient
smtp.DeliveryMethod = SmtpDeliveryMethod.Network; //将smtp的出站方式设为 Network
smtp.EnableSsl = true; //smtp服务器是否启用SSL加密
smtp.Host = this.SmtpHost; //指定 smtp 服务器地址
smtp.Port = this.SmtpPort; //指定 smtp 服务器的端口，默认是25，如果采用默认端口，可省去
smtp.UseDefaultCredentials = true; //如果你的SMTP服务器不需要身份认证，则使用下面的方式，不过，目前基本没有不需要认证的了
smtp.Credentials = new NetworkCredential(this.FromEmailAddress, this.FormEmailPassword); //如果需要认证，则用下面的方式

mm.Priority = MailPriority.Normal; //邮件的优先级，分为 Low, Normal, High，通常用 Normal即可
mm.From = new MailAddress(this.FromEmailAddress, "管理员", Encoding.GetEncoding(936));

//收件人
if (!string.IsNullOrEmpty(this.ToList))
mm.To.Add(this.ToList);
//抄送人
if (!string.IsNullOrEmpty(this.CCList))
mm.CC.Add(this.CCList);
//密送人
if (!string.IsNullOrEmpty(this.BccList))
mm.Bcc.Add(this.BccList);

mm.Subject = this.Subject; //邮件标题
mm.SubjectEncoding = Encoding.GetEncoding(936); //这里非常重要，如果你的邮件标题包含中文，这里一定要指定，否则对方收到的极有可能是乱码。
mm.IsBodyHtml = this.IsBodyHtml; //邮件正文是否是HTML格式
mm.BodyEncoding = Encoding.GetEncoding(936); //邮件正文的编码，设置不正确，接收者会收到乱码
mm.Body = this.Body; //邮件正文
//邮件附件
if (this.AttachmentList != null && this.AttachmentList.Count > 0)
{
foreach (Attachment attachment in this.AttachmentList)
{
mm.Attachments.Add(attachment);
}
}
//发送邮件，如果不返回异常，则大功告成了。
smtp.Send(mm);
}
#endregion
}

}

//测试代码

try
{
EmailHelper email = new EmailHelper("23456789@qq.com", "测试邮件2", "asdasdasdasds");
email.Send();
MessageBox.Show("发送成功！");
}
catch (Exception ex)
{
MessageBox.Show("发送失败！失败原因：");
MessageBox.Show(ex.Message);

}