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Syncfusion Feedback
Platform : ASP.NET
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Category : Mail

Why do I get the error message "The transport failed to connect to the server "

This is a network related error. Your application cannot connect to the mail server specified.
Make sure that the following are true about SmtpMail.SmtpServer:
  • Is a valid SMTP Server
  • Make sure that the server System.Web.Mail is running or can connect to the mail server. Some times firewalls or proxy servers can get in the way.
  • Try specifying the value by IP address. Poor DNS resolution can sometimes hinder name lookups.
  • Make sure that the mail server is running at port 25.
  • If you did not specify a SmtpMail.SmtpServer property, or if SmtpMail.SmtpServer points to "localhost" (or the equivalent), be sure the SMTP Service is running on port 25.
  • For testing purposes change the MailMessage.From and MailMessage.To properties to an address that exists on SmtpMail.SmtpServer. Some times this exception is thrown, when it really is a relay issue.

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