'5.7.1 Client does not have permission' error while sending email from code

c# email exchange-server exchange-server-2010
Kevin DiTraglia picture Kevin DiTraglia · Aug 22, 2012 · Viewed 60.8k times · Source

So I have this very basic program that is trying to send an e-mail, but I keep getting

Mailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as this sender

Here is my program

static void Main(string[] args)
{
    SmtpClient client = new SmtpClient("Server", 25);
    client.UseDefaultCredentials = false;
    client.DeliveryMethod = SmtpDeliveryMethod.Network;
    client.Credentials = new NetworkCredential("UserName", "Password");
    client.Send(new MailMessage("[email protected]","Recipient"));
}

I know the credentials work, if I run SMTP Test Tool 3.0 with the same data everything works great.

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Here is some screen shots on a receive connector set up for my IP on the exchange server

enter image description here

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Anybody have any ideas what would be causing this error in my code, but not within the simple SMTP testing tool? Am I missing some kind of authentication option somewhere? I have quadruple checked all the information is correct and identical in both places and it works in the tool but not in the code.

Answer

Kevin DiTraglia picture Kevin DiTraglia · Aug 30, 2012

I found the problem, I needed to check the box 'Accept any sender' for authenticated users.

enter image description here

More information here: http://technet.microsoft.com/en-us/library/aa997170(EXCHG.140).aspx

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