I have to send email from all SMTP senders

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I have Multiple Smtp Senders , i just want to send Emails from all senders in One Shot, i ahve all SMtp in Datatable, adding all smtps in SmtpClient Which is ListType,and adding all reciver in another list which is MailMessage TYpe.All is going smoothly only i just want to send All Emails In One Shot ,without For Loop.
Or can we do this in SqlServer, Any help would be life Saver,Thx in advance

What I have tried:

Hi here i am adding SMTP also in the list but , i need to call it inside for loop to send, so means if i have 150 SMTp , i need to call (SMTP.send) 150 times and it will take too much of time , please Review this code

public void SendEmailFromAllSender()
{
DataTable dtNewSMtp = new DataTable();
// aRandom = Get16DigitRandom();
DataRow dr;
dtNewSMtp.Columns.AddRange(new DataColumn[2] { new DataColumn("Email"), new DataColumn("Pwd") });

dr = dtNewSMtp.NewRow();
dr[0] = "firstsender@gmail.com";
dr[1] = "password1";
dtNewSMtp.Rows.Add(dr);

dr = dtNewSMtp.NewRow();
dr[0] = "secondsender@gmail.com";
dr[1] = "password2";
dtNewSMtp.Rows.Add(dr);

int messagesNeeded = dtNewSMtp.Rows.Count;
List<mailmessage> messages = new List<mailmessage>(messagesNeeded);
List<smtpclient> SMTpClients = new List<smtpclient>(messagesNeeded);

for (int i = 0; i < messagesNeeded; i++)
{
MailMessage mail = new MailMessage();
mail.To.Add("reciver1@gmail.com");
mail.Subject = "This is a Subject";
mail.Body = "i am a testing body How are you dear may i check you" + i;
mail.IsBodyHtml = true;
mail.From = new System.Net.Mail.MailAddress(dtNewSMtp.Rows[i][0].ToString(), "CHeck EMail");
messages.Add(mail);

SmtpClient NewSmtp = new SmtpClient("smtp.gmail.com", 587);
NewSmtp.Credentials = new NetworkCredential(dtNewSMtp.Rows[i]["Email"].ToString(), dtNewSMtp.Rows[i]["Pwd"].ToString());
NewSmtp.EnableSsl = true;
SMTpClients.Add(NewSmtp);

}

for (int k = 0; k < messagesNeeded; k++)
{
SMTpClients[k].Send(messages[k]);// Please Tell me here how i can send all emails in one shot without the loop
}

}

Posted 17-May-22 19:46pm

Ramendra Kumar Sinha

Updated 17-May-22 23:04pm

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OriginalGriff · Answer 1 · 2022-05-17T20:05:00

You can't.
Each SMTP sender is a separate application, a separate service - and each must be specifically told to send a mail. A bit like sending a snail mail letter to multiple people telling them to "buy cheese": each person needs a separate envelope, a separate letter inside it, a separate message on the letter (even if all messages are the same), a separate stamp.

Richard Deeming · Answer 2 · 2022-05-17T23:04:00

Reading between the lines, the problem you're trying to solve is that it's taking too long to send a message, wait for it to finish, then send the next message.

If you use the SmtpClient.SendMailAsync method[^], you can start all 150 "send" operations at once, and then wait for them all to complete:

C#

int messagesNeeded = dtNewSMtp.Rows.Count;
List<Task> sendTasks = new(messagesNeeded);
for (int i = 0; i < messagesNeeded; i++)
{
    MailMessage mail = new();
    mail.To.Add("reciver1@gmail.com");
    mail.Subject = "This is a Subject";
    mail.Body = "i am a testing body How are you dear may i check you" + i;
    mail.IsBodyHtml = true;
    mail.From = new(dtNewSMtp.Rows[i][0].ToString(), "CHeck EMail");
    messages.Add(mail);

    SmtpClient smtp = new("smtp.gmail.com", 587);
    smtp.Credentials = new(dtNewSMtp.Rows[i]["Email"].ToString(), dtNewSMtp.Rows[i]["Pwd"].ToString());
    smtp.EnableSsl = true;
    
    Task sendTask = smtp.SendMailAsync(mail);
    sendTasks.Add(sendTask);
}

Task.WaitAll(sendTasks.ToArray());

// Or, in an async method: 
// await Task.WhenAll(sendTasks);

NB: As I said to your colleague yesterday[^], this sort of code is highly likely to get your email account banned for spamming.

I have to send email from all SMTP senders

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