SMTP Error?

Question

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 tamerelanwer@gmail.com

Kirtan Patel · Answer

IIS 6 -------------------------- 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

Tamer Khalil · Answer

then it is situation 1 how to solve> i am using iis 7.

Kirtan Patel · Answer

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 .csharpcode .csharpcode pre { font-size: small; color: black; font-family: Consolas Courier New Courier Monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } 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!   alert('Thanks! for using this tool.')  ); } catch (Exception ex) { txtStatus.Text = ex.ToString(); } } if it helps yo please check  Do you like this answer  :)