System.Net.Mail.SmtpException: Failure sending mail.

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Hi,

While sending to more than 15 clients an email newsletter I am getting this error:

System.Net.Mail.SmtpException: Failure sending mail. ---&gt; System.IO.IOException: Unable to read data from the transport connection: net_io_connectionclosed. at System.Net.Mail.SmtpReplyReaderFactory.ProcessRead(Byte[] buffer, Int32 offset, Int32 read, Boolean readLine) at System.Net.Mail.SmtpReplyReaderFactory.ReadLines(SmtpReplyReader caller, Boolean oneLine) at System.Net.Mail.SmtpReplyReaderFactory.ReadLine(SmtpReplyReader caller) at System.Net.Mail.CheckCommand.Send(SmtpConnection conn, String&amp; response) at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException&amp; exception) at

Please can u help fixing this error.

Posted 8-Apr-14 7:08am

El Dev

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ZurdoDev 8-Apr-14 13:09pm

Sounds like an SMTP issue not a code issue.

El Dev 8-Apr-14 13:11pm

So what can I do?

Bernhard Hiller 9-Apr-14 3:56am

Your provider tries to fight spammers sending a message to many recipients. And from his point of view, you look like such a spammer! You may need to buy a special package from them which allows for such mass email.

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 1 · 2014-04-08T08:14:00

Solution 1

Read the following threads. Might be useful. Seems like your ISP is blocking emails on the port.

1. SMTPException : Unable to read data from the transport connection: net_io_connectionclosed[^]
2. SmtpException: Unable to read data from the transport connection: net_io_connectionclosed[^]

Posted 8-Apr-14 8:14am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)