SMTP Error?

Tamer Khalil

17y5.6k.NET

I got this error when i'm running an application that sends automated e-mail from our servers.
Mailbox unavailable. The server response was: 5.7.1 Unable to relay for [email protected]

3 Replies

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Kirtan Patel17y ago

IIS 6
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IIS 6 Manager > SMTP Server Virtual Server > Properties > Access > Relay tab. Add 127.0.0.1 and retest.

On IIS 7 Check
-------------------

start>>control panel>>administrative tools>>internet information services

adding features to server by Using "Add Features Wizard" you can add Simple Mail Transfer Protocol (SMTP) Server with IIS7

if it helps you please check "Do you like this answer"

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Tamer Khalil17y ago
then it is situation 1, how to solve> i am using iis 7.
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Kirtan Patel17y ago
Friend, Here is Explaination to your problem

if it helps yo please check "Do you like this answer" :)

Two Reason can be there for that

Situation 1:

They are on an IP Address that is specified outside your allowed relay range.

Situation 2:

SMTP not authenticating

try to send mail with code like below

protected void btnSend_Click(object sender, EventArgs e)
{
SmtpClient client = new SmtpClient();
MailMessage message = new MailMessage();
client.Port = 587;
client.Host = "smtp.gmail.com";
client.UseDefaultCredentials = true;
client.Credentials = new System.Net.NetworkCredential(txtemail.Text ,txtpass.Text );
client.EnableSsl = true;
try
{
MailAddress SendTo = new MailAddress(txtTo.Text);
MailAddress SendFrom = new MailAddress(txtFrom.Text);
message = new MailMessage(SendFrom, SendTo);
message.Body = txtMessage.Text;
message.Subject = txtSub.Text;
client.Send(message);
txtStatus.Text = "Your email has been sent";
Page.RegisterClientScriptBlock("Thanks!", "");
}
catch (Exception ex)
{
txtStatus.Text = ex.ToString();
}
}

if it helps yo please check "Do you like this answer" :)
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