Add a new post


Name  
Email*  
Subject  
Message
 
 
Protected by Clearscreen.SharpHIPTo prevent abuse from bots, please enter the text you see.:
 

* In order to reduce SPAM, all email addresses will be obfuscated so they cannot be read by spam bots.
For example: 'test@test.com' will become 'test (at) test dot com'.

The specified protocol is unknown.
This is probably a relay error. Make sure you can relay through the SmtpMail.SmtpServer either by your IP address, by your MailMessage.From address, or if you need to authenticate, check out 3.8 How do I authenticate to send an email?
If SmtpMail.SmtpServer is set to "127.0.0.1" or "localhost", and you are using the built in IIS SMTP Service, you can allow relaying for 127.0.0.1 by

  • Opening the IIS Admin MMC
  • Right-Clicking on the SMTP Virtual Server and selecting Properties
  • On the Access tab, click the Relay button
  • Grant 127.0.0.1 (or the IP address used by System.Web.Mail) to the Computers list.
  • Close all dialogs
  • Restarting the SMTP Service
Also, be sure to check the InnerException for any additional, helpful information.