asp.net - 在 ASP.NET 中发送大量电子邮件

Question

这是我发送大量电子邮件的代码。我想优化此代码以确保它能够正常工作并且可以成功发送所有电子邮件。我应该怎么办？我知道在发送之间设置中断可能很有用，但我该怎么做呢？

主要问题是避免将电子邮件分类为垃圾邮件并减少发送失败的电子邮件数量。

var list = from c in context.Emails orderby c.EmailAddress select c.EmailAddress;
MailMessage mail = new MailMessage();
try
{
    mail.From = new MailAddress(txtfrom.Text);
    foreach (var c in list)  
    {  
        mail.To.Add(new MailAddress(c.ToString()));
    }
    mail.Subject = txtSub.Text;
    mail.IsBodyHtml = true;
    mail.Body = txtBody.Text;
    if (FileUpload1.HasFile)
    {
        mail.Attachments.Add(new Attachment(
           FileUpload1.PostedFile.InputStream, FileUpload1.FileName));
    }
    SmtpClient smtp = new SmtpClient();
    smtp.Send(mail); 
}
catch (Exception)
{
    //exception handling
}

Answer 1

我建议您不要将所有收件人添加到同一邮件中。

而是使用此代码:

mail.From = new MailAddress(txtfrom.Text);
mail.Subject = txtSub.Text;
mail.IsBodyHtml = true;
mail.Body = txtBody.Text;
if (FileUpload1.HasFile)
{
    mail.Attachments.Add(new Attachment(FileUpload1.PostedFile.InputStream, FileUpload1.FileName));
}
SmtpClient smtp = new SmtpClient();
foreach (var c in list)  
{  
    mail.To.Clear();
    mail.To.Add(new MailAddress(c.ToString()));
    smtp.Send(mail);
}