c# 实现发送邮件到指定邮箱

<appSettings>
  <!--begin 邮箱配置-->
  <add key="smtpServer" value="smtp.qq.com" /><!--邮箱SMTP服务器 可用qq邮箱、163邮箱，只是关键字不一样-->
  <add key="mailFrom" value="1509802981@qq.com" /><!--当前发件箱的邮箱账号-->
  <add key="userPassword" value="wckfuxwamayvgiba" /> <!--当前发件授权码，需要去发件开通获取 -->
  <add key="mailTo" value="1509802981@qq.com;1509802981@qq.com" /><!--收件人：收件箱邮箱名称，多个收件人以分号;做分割符，这里我用同一个做测试-->
  <!--end 邮箱配置-->
 </appSettings>

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

namespace ProjectWebDAL
{
  public static class EmailHelper
  {
    #region 发送邮件
    /// <summary>
    /// 发送邮件
    /// </summary>
    /// <param name="mailSubject">邮箱主题</param>
    /// <param name="mailContent">邮箱内容</param>
    /// <returns>返回发送邮箱的结果</returns>
    public static bool SendEmail(string mailSubject, string mailContent)
    {
      // 设置发送方的邮件信息
      string smtpServer = System.Configuration.ConfigurationManager.AppSettings["smtpServer"];//SMTP服务器 //smtp.qq.com 
      string mailFrom = System.Configuration.ConfigurationManager.AppSettings["mailFrom"]; // 当前发件箱登陆名
      string userPassword = System.Configuration.ConfigurationManager.AppSettings["userPassword"]; //授权码，在当前发送邮箱里面进行设置 
      string mailTo = System.Configuration.ConfigurationManager.AppSettings["mailTo"]; //收件人：收件箱邮箱名称，多个收件人以分号;做分割符
      bool b = false;
      string[] mailTos = mailTo.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
      // 邮件服务设置
      SmtpClient smtpClient = new SmtpClient();
      smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;//指定电子邮件发送方式
      //smtpClient.DeliveryMethod = SmtpDeliveryMethod.PickupDirectoryFromIis;//指定电子邮件发送方式
      smtpClient.Host = smtpServer; //指定SMTP服务器
      smtpClient.Credentials = new System.Net.NetworkCredential(mailFrom, userPassword);//用户名和密码
      for (int i = 0; i < mailTos.Length; i++)
      {
        // 发送邮件设置    
        MailMessage mailMessage = new MailMessage(mailFrom, mailTos[i]);
        mailMessage.Subject = mailSubject;//主题
        mailMessage.Body = mailContent;//内容
        mailMessage.BodyEncoding = Encoding.UTF8;//正文编码
        mailMessage.IsBodyHtml = true;//设置为HTML格式
        mailMessage.Priority = MailPriority.Low;//优先级
        try
        {
          smtpClient.Send(mailMessage); // 发送邮件
          b = true;
        }
        catch (SmtpException ex)
        {
          return false;
        }
      }
      return b;
    }


    #endregion
  }
}

//邮件发送
    public JsonResult Email()
    {
      ResultInfo result = new ResultInfo();
      EmailHelper.SendEmail("我是邮件主题", "我是邮件内容 ");
      result.res = true;
      result.info = "邮件发送成功！";
      return Json(result, JsonRequestBehavior.AllowGet);
    }

    //自定义返回json数据类型
    public class ResultInfo
    {
      public bool res { get; set; }
      public string info { get; set; }
    }