Sending bulk email

Posted on 2011-02-15
Medium Priority
Last Modified: 2014-07-22

I'm trying to send an email for over 65,000 users via an asp.net application with Net.Mail.SmtpClient.

However, I'm getting this exception:
System.Net.Mail.SmtpException: Failure sending mail. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.

I have updated web.config to
<httpRuntime executionTimeout="400000" useFullyQualifiedRedirectUrl="true" maxRequestLength="614400" requestLengthDiskThreshold="10240" />

Any ideas?
Question by:_MMG_

Expert Comment

ID: 34901679
Over 65000 users? Are they really asking for your mail or are you trying to write a spam-bot?


Author Comment

ID: 34901717
it's a newsletter - they are expecting the email
LVL 84

Accepted Solution

Dave Baldwin earned 1000 total points
ID: 34901920
ISPs often limit the number of emails you can send per day or per hour.  I've seen anywhere from 25 per hour to 1000 per day.  After that you're blocked until the next time period.  That is done to prevent their servers from being blacklisted and unable to send and receive email.

Many of us recommend bulk email services like Constant Contact or Aweber who have their own servers and connections and specialize in sending email.

Assisted Solution

onemadeye earned 1000 total points
ID: 34968527
For up to 65000 users why dont you use the services as provided by @DaveBaldwin
I really think it will help you a lot...

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