<>
发送邮件报错说明
发送邮件 假设发送人的邮箱username与邮箱password都没有填写错误：假设报：參数或变量中有语法错误。 server响应为:mail from address must be same as authorization user错误，问题可能出在authorization user 没授权。假设是QQ邮箱。那么仅仅要进入QQ邮箱。QQ邮箱：设置---账户 找到POP3/IMAP/SMTP服务 都开启。这时候发现能够发送邮件了。
假设报：SMTP server要求安全连接或client未通过身份验证。
server响应为:Must issue a STARTTLS command first. 可能出现的问题是发送邮件的serverport（smtp.Port）配置错误。 比如：smtp.Port = 25
假设报：命令顺序不对。
server响应为:Error: need EHLO and AUTH first ! 非常有可能是发件人邮箱的username写错了；比如：（smtp.Credentials = new NetworkCredential("邮箱的username", "发件人邮箱password");
假设报：參数或变量中有语法错误。 server响应为:mail from address must be same as authorization user 非常有可能是发件人邮箱的password错误了：比如：（smtp.Credentials = new NetworkCredential("邮箱的username", "发件人邮箱password");
==============================================================================
web.config配置文件
Home控制器
using CFPS_Redesign;using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;namespace MVC发送邮件測试.Controllers{ public class HomeController : Controller { // // GET: /Home/ public ActionResult SendEmail() { EmailHelper eh = new EmailHelper("邮件的主题", "你什么时候过来吃饭？"); if (eh.SendEmail()) { return View(); } else { return Content("on"); } } }} EmailHelper邮件发送类
using System;using System.Collections.Generic;using System.Configuration;using System.Linq;using System.Net;using System.Net.Mail;using System.Text;namespace CFPS_Redesign{ /// /// Author : Bin /// Date : 2015-06-26 /// Description : 邮件发送辅助类 /// 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; private string _ToEmailListString = string.Empty; private string _CcEmailListString = string.Empty; private string _BccEmailListString = string.Empty; /// /// smtp server /// public string SmtpHost { get { if (string.IsNullOrEmpty(_SmtpHost)) { _SmtpHost = ConfigurationManager.AppSettings["SmtpHost"]; } return _SmtpHost; } } /// /// smtp serverport 默觉得25 /// public int SmtpPort { get { if (_SmtpPort == -1) { if (!int.TryParse(ConfigurationManager.AppSettings["SmtpPort"], out _SmtpPort)) { _SmtpPort = 25; } } return _SmtpPort; } } /// /// 发送者 Eamil 地址 /// public string FromEmailAddress { get { if (string.IsNullOrEmpty(_FromEmailAddress)) { _FromEmailAddress = ConfigurationManager.AppSettings["FromEmailAddress"]; } return _FromEmailAddress; } } /// /// 发送者 Eamil password /// public string FormEmailPassword { get { if (string.IsNullOrEmpty(_FormEmailPassword)) { _FormEmailPassword = ConfigurationManager.AppSettings["FormEmailPassword"]; } return _FormEmailPassword; } } #endregion #region [ 属性(邮件相关) ] /// /// 收件人 Email 列表，多个邮件地址之间用 半角逗号“,”或者分号“;”,或者竖线“|” 等符号分隔开 /// public string ToEmailListString { get { if (string.IsNullOrEmpty(_ToEmailListString)) { return ConfigurationManager.AppSettings["ToEmailListString"]; } return _ToEmailListString; } set { this._ToEmailListString = value; } } /// /// 邮件的抄送者，支持群发，多个邮件地址之间用 半角逗号“,”或者分号“;”,或者竖线“|” 等符号分隔开 /// public string CcEmailListString { get { if (string.IsNullOrEmpty(this._CcEmailListString)) { return ConfigurationManager.AppSettings["CcEmailListString"]; } return _CcEmailListString; } set { this._CcEmailListString = value; } } /// /// 邮件的密送者，支持群发，多个邮件地址之间用 半角逗号“,”或者分号“;”,或者竖线“|” 等符号分隔开 /// public string BccEmailListString { get { if (string.IsNullOrEmpty(_BccEmailListString)) { return ConfigurationManager.AppSettings["BccEmail"]; } return _BccEmailListString; } set { this._BccEmailListString = value; } } /// /// 邮件标题 /// public string Subject { get; set; } /// /// 邮件正文 /// public string EmailBody { get; set; } private bool _IsBodyHtml; /// /// 邮件正文是否为Html格式 /// public bool IsBodyHtml { get { return _IsBodyHtml; } set { _IsBodyHtml = value; } } /// /// 附件列表 /// public List AttachmentList { get; set; } #endregion #region [ 构造函数 ] /// /// 构造函数(EmailBody默觉得html格式) /// /// 邮件标题 /// 邮件正文 public EmailHelper(string subject, string emailBody) { this.Subject = subject; this.IsBodyHtml = true; this.EmailBody = emailBody; } /// /// 构造函数 /// /// 邮件标题 /// 邮件正文是否为Html格式 /// 邮件正文 public EmailHelper(string subject, bool isBodyHtml, string emailBody) { this.Subject = subject; this.IsBodyHtml = IsBodyHtml; this.EmailBody = emailBody; } /// /// 构造函数(EmailBody默觉得html格式) /// /// 邮件标题 /// 邮件正文 /// 附件列表 public EmailHelper(string subject, string emailBody, List attachmentList) { this.Subject = subject; this.EmailBody = emailBody; this.AttachmentList = attachmentList; this.IsBodyHtml = true; } /// /// 构造函数 /// /// 邮件标题 /// 邮件正文 /// 邮件正文是否为Html格式 /// 附件列表 public EmailHelper(string subject, string emailBody, bool isBodyEmail, List attachmentList) { this.Subject = subject; this.EmailBody = emailBody; this.AttachmentList = attachmentList; } /// /// 构造函数 (EmailBody默觉得html格式) /// /// 收件人列表字符串 /// 邮件标题 /// 邮件正文 public EmailHelper(string toEmailListString, string subject, string emailBody) { this.ToEmailListString = toEmailListString; this.Subject = subject; this.EmailBody = emailBody; this.IsBodyHtml = true; } /// /// 构造函数 /// /// 收件人列表字符串 /// 邮件标题 /// 邮件正文是否为Html格式 /// 邮件正文 public EmailHelper(string toEmailListString, string subject, bool isBodyHtml, string emailBody) { this.ToEmailListString = toEmailListString; this.Subject = subject; this.IsBodyHtml = isBodyHtml; this.EmailBody = emailBody; } /// /// 构造函数 /// /// 收件人列表字符串 /// 抄送人列表字符串 /// 邮件标题 /// 邮件正文是否为Html格式 /// 邮件正文 public EmailHelper(string toEmailListString, string ccEmailListString, string subject, bool isBodyHtml, string emailBody) { this.ToEmailListString = toEmailListString; this.CcEmailListString = ccEmailListString; this.Subject = subject; this.IsBodyHtml = isBodyHtml; this.EmailBody = emailBody; } /// /// 构造函数 /// /// 收件人列表字符串 /// 抄送人列表字符串 /// 邮件标题 /// 邮件正文是否为Html格式 /// 邮件正文 /// 附件列表 public EmailHelper(string toEmailListString, string ccEmailListString, string subject, bool isBodyHtml, string emailBody, List attachmentList) { this.ToEmailListString = toEmailListString; this.CcEmailListString = ccEmailListString; this.Subject = subject; this.IsBodyHtml = isBodyHtml; this.EmailBody = emailBody; this.AttachmentList = attachmentList; } /// /// 构造函数 /// /// 收件人列表字符串 /// 抄送人列表字符串 /// 密送人列表字符串 /// 邮件标题 /// 邮件正文是否为Html格式 /// 邮件正文 public EmailHelper(string toEmailListString, string ccEmailListString, string bccEmailListString, string subject, bool isBodyHtml, string emailBody) { this.ToEmailListString = toEmailListString; this.CcEmailListString = ccEmailListString; this.BccEmailListString = bccEmailListString; this.Subject = subject; this.IsBodyHtml = isBodyHtml; this.EmailBody = emailBody; } /// /// 构造函数 /// /// 收件人列表字符串 /// 抄送人列表字符串 /// 密送人列表字符串 /// 邮件标题 /// 邮件正文是否为Html格式 /// 邮件正文 /// 附件列表 public EmailHelper(string toEmailListString, string ccEmailListString, string bccEmailListString, string subject, bool isBodyHtml, string emailBody, List attachmentList) { this.ToEmailListString = toEmailListString; this.CcEmailListString = ccEmailListString; this.BccEmailListString = bccEmailListString; this.Subject = subject; this.IsBodyHtml = isBodyHtml; this.EmailBody = emailBody; this.AttachmentList = attachmentList; } #endregion #region [ 发送邮件 ] /// /// 发送邮件 /// ///