C# 如何实现邮件发送

调用发送

try
            {
                P2BEmail email = new P2BEmail();
                email.fromEmail = txtfromEmail.Text; //　　QQ邮箱
                email.fromPwd = txtfrompwd.Text;　　  //　　QQ邮箱授权码
                email.emailType = txtemailtype.Text;　　//　　smtp.qq.com
                email.SendEmail(txttoemail.Text, txtsubject.Text, txtbody.Text, "");
                txtmessage.Text = "成功";
            }
            catch (Exception ex)
            {

                txtmessage.Text = ex.Message + ex.StackTrace;
            }

邮件发送逻辑

public class P2BEmail
    {
        public string fromEmail = "XX@qq.com";//邮件发送方

        public string fromPwd = "XXXXXXXXXX"; //邮件发送方密码/QQ授权码

        public string emailType = "smtp.qq.com";//邮件类型 smtp.163.com.cn; smtp.qq.com.cn; smtp.126.com.cn;  smtp.sina.com.cn

        /// <summary>
        /// 发送电子邮件
        /// </summary>
        /// <param name="toEmail">接收方电子邮件</param>
        /// <param name="subject">邮件标题</param>
        /// <param name="body">邮件内空</param>
        public void SendEmail(string toEmail, string subject, string body, string attFile)
        {

            MailAddress addrFrom = new MailAddress(fromEmail, fromEmail);
            MailAddress addrTo = new MailAddress(toEmail, toEmail);
            MailMessage mm = new MailMessage(addrFrom, addrTo);
            mm.BodyEncoding = Encoding.UTF8;
            mm.IsBodyHtml = true;
            mm.Subject = subject;
            mm.Body = body;

            if (!string.IsNullOrEmpty(attFile))
            {
                Attachment att = new Attachment(attFile, MediaTypeNames.Application.Octet);
                ContentDisposition cd = att.ContentDisposition;
                cd.CreationDate = File.GetCreationTime(attFile);
                cd.ModificationDate = File.GetLastWriteTime(attFile);
                cd.ReadDate = File.GetLastAccessTime(attFile);
                mm.Attachments.Add(att);//添加附件
            }

            NetworkCredential nc = new NetworkCredential(fromEmail, fromPwd);
            SmtpClient smtp = new SmtpClient(emailType);
            smtp.EnableSsl = true;　　//启用SSl
　　　　　　  //　　随请求一起发送
            smtp.UseDefaultCredentials = false;
　　　　　　  //　　邮件账户凭证
            smtp.Credentials = nc;
　　　　　　　//　　邮件发送方式-网络发送
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
　　　　　　　//　　服务器证书验证回调　
            ServicePointManager.ServerCertificateValidationCallback =delegate (Object obj, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) { return true; };　　

            try
            {
                smtp.Send(mm);
            }
            catch (SmtpFailedRecipientException)
            {
                smtp.Dispose();
                return;
            }
            catch (Exception ex)
            {
                throw ex;
            }
            smtp.Dispose();

        }

    }

下载地址：源码下载.zip