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i am getting an error saying "5.7.1: Unable to relay for [email protected]"

any ideas what this means?

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    Please use "c#" tag. 31000+ for this and zero for csharp. Commented Jul 31, 2009 at 17:47
  • Another small point: you're not sending email in C#. You're sending email in .NET, using a program you wrote in the C# programming language. Presumably the exact same problem would have occurred if you'd written the code in VB.NET. Commented Jul 31, 2009 at 17:49
  • I changed it to "email .net smtp", since it had nothing to do with C# in specific, but plenty to do with both email in general and SMTP in specific. Commented Jul 31, 2009 at 20:09

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It means that the SMTP server you are using doesn't allow relaying - this could be because you're not authenticating, or not sending to an email address that is local. There is an option (in IIS SMTP anyway) to allow relaying without authentication

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The SMTP server has to be configured to relay mail to other domains.

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Did you specify a SMTP server? Can we see some of your code?

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