無法通過SMTP發送郵件使用Asp.Net

我需要發送郵件給60到100名學生，當我點擊發送按鈕。這是行之有效的，如果我有6至7名學生，但是當我開始發送給60名學生我的代碼顯示以下錯誤無法通過SMTP發送郵件使用Asp.Net

系統存儲不足。服務器響應是：每個連接的電子郵件太多。

這裏是我的代碼

保護無效btnsend_Click（對象發件人，EventArgs的）{

 if (drptopics.SelectedValue == "-1") 
      { 
       Response.Write(@"<script language='javascript'>alert('Please select one Topic');</script>"); 
      } 


    else 

    { 

    SqlConnection conn = new SqlConnection(); 
    conn.ConnectionString = "Data Source=xxxx; User Id=sa; Password=xxxx; Initial Catalog=xxxx; Integrated Security=SSPI;"; 
    conn.Open(); 


    SqlCommand cmd = new SqlCommand(); 
    cmd.Connection = conn; 
    cmd.CommandText = "select EMail_1 from Student_Info where Branch_Code='ap' and Student_ID in(select Student_ID from Admissions where Branch_Code='ap' and Batch_ID='" + txtbatchid.Text + "')"; 
    cmd.CommandType = CommandType.Text; 

    SqlDataAdapter da = new SqlDataAdapter(cmd); 
    da.SelectCommand = cmd; 
    DataSet ds = new DataSet(); 
    da.Fill(ds); 




    if (ds.Tables[0].Rows[0][0] != null) 
    { 
     int count = ds.Tables[0].Rows.Count; 


     for (int i = 0; i < count; i++) 
     { 

      MailMessage mm = new MailMessage(); 
      mm.To.Add(new MailAddress(ds.Tables[0].Rows[i][0].ToString())); 
      mm.From = new MailAddress("[email protected]"); 
      mm.Subject = "SMS and Interview Questions of Oracle 11g DBA"; 
      mm.IsBodyHtml = true; 





      //Day 1 Architecture 1 
      if (drptopics.SelectedValue == "1") 
      { 
       Attachment attachment1 = new Attachment(Server.MapPath("~/Oracle 11g DBA/Day 1/Architecture-1-I.doc")); //create the attachment 
       mm.Attachments.Add(attachment1); 
       Attachment attachment2 = new Attachment(Server.MapPath("~/Oracle 11g DBA/Day 1/Architecture1-S.doc")); //create the attachment 
       mm.Attachments.Add(attachment2); 

      } 


      //Day 2 Architecture 2 
      else if (drptopics.SelectedValue == "2") 
      { 
       Attachment attachment1 = new Attachment(Server.MapPath("~/Oracle 11g DBA/Day 2/Architecture-2-I.doc")); //create the attachment 
       mm.Attachments.Add(attachment1); 
       Attachment attachment2 = new Attachment(Server.MapPath("~/Oracle 11g DBA/Day 2/Architecture2-S.doc")); //create the attachment 
       mm.Attachments.Add(attachment2); 
      } 

      mm.Body = "<html><head><body><h1>Thank you for choosing Wilshire</h1><br><b>Team Wilshire<b></body></head></html>"; 
      SmtpClient s = new SmtpClient("smtp.net4india.com"); 
      s.Send(mm); 


     } 

    }

}

請告訴我解決........ ................

來源

2013-07-25 user2618074

身體是否一模一樣？將所有收件人放入密件抄送中，並用一封電子郵件發送。 – Alexander

取決於查詢cmd.CommandText =「從Student_Info中選擇EMail_1，其中Branch_Code ='ap'和Student_ID in（從Admissions中選擇Student_ID，其中Branch_Code ='ap'和Batch_ID ='」+ txtbatchid.Text +''）「;電子郵件將會改變 – user2618074

在我的回答中，我將展示如何將所有收件人放入BCC –

SmtpClient.SendAsync()可能會導致其他問題（SMTP服務器設置每分鐘的最大郵件數量，避免垃圾郵件）！

由於郵件完全相同，因此解決方案爲1個郵件，收件人全部爲隱藏收件人（Bcc）！

MailMessage mm = new MailMessage(); 

for (int i = 0; i < count; i++) 
{ 
    mm.Bcc.Add(new MailAddress(ds.Tables[0].Rows[i][0].ToString())); 
} 
mm.To.Add(new MailAddress("[email protected]"); 
mm.From = new MailAddress("[email protected]"); 
mm.Subject = "SMS and Interview Questions of Oracle 11g DBA"; 

.... 

SmtpClient s = new SmtpClient("smtp.net4india.com"); 
s.Send(mm);

來源

2013-07-25 10:36:14

非常感謝你的工作很好，非常感謝 – user2618074