Question

我正在使用mvc application 4.5。

我已经创建了邮件发送功能，邮件正文带有html表格并链接类似的东西，并附上pdf文件但每封垃圾邮件如何防止垃圾邮件

我的代码在

下面

var message = new MailMessage();
            message.From = from;
            message.To.Add(to);
            if (null != bcc)
            {
                foreach (var address in bcc.Where(bccValue => !String.IsNullOrWhiteSpace(bccValue)))
                {
                    message.Bcc.Add(address.Trim());
                }
            }
            if (null != cc)
            {
                foreach (var address in cc.Where(ccValue => !String.IsNullOrWhiteSpace(ccValue)))
                {
                    message.CC.Add(address.Trim());
                }
            }
            message.Subject = subject;
            message.Body = body;
            message.IsBodyHtml = true;
            using (var smtpClient = new SmtpClient())
            {
                smtpClient.UseDefaultCredentials = emailAccount.UseDefaultCredentials;
                smtpClient.Host = emailAccount.Host;
                smtpClient.Port = emailAccount.Port;
                smtpClient.EnableSsl = emailAccount.EnableSsl;
                if (emailAccount.UseDefaultCredentials)
                    smtpClient.Credentials = CredentialCache.DefaultNetworkCredentials;
                else
                    smtpClient.Credentials = new NetworkCredential(emailAccount.Username, emailAccount.Password);                
                string Gid = Guid.NewGuid().ToString();
                string pdfcreateandpath = conversionsavepath + Gid + ".pdf";
                bool flag = createpdf(contentconversion, conversionsavepath, pdfcreateandpath);
                if (flag)
                {
                    //
                    LogMessage(" pdf created is  : " + flag);

                    if (System.IO.File.Exists(pdfcreateandpath))
                    {

                          LogMessage(" pdf file path exists is  : " +                                                System.IO.File.Exists(pdfcreateandpath));

                        // Attach pdf document here.
                        message.Attachments.Add(new Attachment(pdfcreateandpath));                        
                        smtpClient.Send(message);                       

                    }

Answer 1

从代码发送的邮件可能因各种原因而转到垃圾邮件

如果您的服务器IP列入黑名单
如果您要发送大尺寸或某些类型的文件
如果您的邮件内容包含某些字词
如果用户为某些域设置了垃圾邮件过滤器

阅读此页面http://mailchimp.com/resources/guides/how-to-avoid-spam-filters/html/了解更多信息。

还尝试使用sendgrid http://sendgrid.com/transactional-email/pricing来测试您的代码，以确保您的服务器的IP不是黑名单。 Sendgrid为初学者提供免费计划。

邮件发送时如何防止垃圾邮件

1 个答案: