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PONot all e-mails being sent using SmtpClient in an ASP.NET MVC getting delivered. Why? How to resolve?
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copied!<p>Here is the set-up:</p> <ol> <li>I have a Notifications controller that is called from task scheduler 1x/day</li> <li>The action method pulls upwards of 300 addresses, loops thru them and uses the SmtpClient class to send an individual e-mail to each recepient.</li> </ol> <p>From what I can tell the process runs fine with no exceptions ... <em>except</em> that not all e-mails are being delivered. Anyone have any ideas on what is going on and how to resolve?</p> <p>Here is the code:</p> <pre><code>foreach (var emp in division.Users) { var fromAddress = "myfromaddress"; var mailServer = "mymailserver"; var toEmail = emp.EmailAddress; var message = new MailMessage(fromAddress, toEmail) { Subject = subject, Body = "<body style='font:normal 13px tahoma,arial,helvetica;'>" + body + "</body>", IsBodyHtml = true }; var client = new SmtpClient(mailServer); client.Send(message); } </code></pre> <p><strong>UPDATE:</strong></p> <p>Adding a pause in between sending e-mails resolves the problem. But why does this work? And is there a better way (e.g. using Async()) that would equally resolve the issue in a better way??? </p> <p>Updated code ...</p> <pre><code>foreach (var emp in division.Users) { var fromAddress = "myfromaddress"; var mailServer = "mymailserver"; var toEmail = emp.EmailAddress; var message = new MailMessage(fromAddress, toEmail) { Subject = subject, Body = "<body style='font:normal 13px tahoma,arial,helvetica;'>" + body + "</body>", IsBodyHtml = true }; var client = new SmtpClient(mailServer); client.Send(message); Thread.Sleep(3000); // Wait 3s until sending next message } </code></pre>

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