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Sending Email from VB.net using the same mailserver used for Lotus Notes

I am receiving the below mentioned error while sending the mail from my VB.net application.
The mailserver used is the same one used by our lotus notes.
Transaction failed. The server response was: Relay rejected for policy reasons.
Try

Dim msg As MailMessage
Dim objSmtpClient As New System.Net.Mail.SmtpClient()

msg = New MailMessage()

msg.From = New System.Net.Mail.MailAddress(txtFromId.Text)
msg.To.Add(New System.Net.Mail.MailAddress(txtToId.Text))
msg.Subject = "Test Mail"
msg.Body = txtBody.Text
objSmtpClient.UseDefaultCredentials = True
objSmtpClient.Credentials = New Net.NetworkCredential("xxxxxxxx", "xxxxxxxx")
objSmtpClient.DeliveryMethod = SmtpDeliveryMethod.Network
objSmtpClient.Host = txtIP.Text.Trim()
objSmtpClient.Port = 25
objSmtpClient.Send(msg)

Catch ex As Exception

End Try

Yiogi

Your code is ok, the problem is with your exchange server policy. It will not let you relay and send mail as someone else from another machine.

You can configure exchange to allow relay but it's a security hole and I strongly advice against it.

If you do choose to configure it please make sure you only allowed a specific ip from the machine you want to send the email to be able to do this and don't open it for everyone on the internet or you will find out your mail server is getting abused and used for sending spam from all over the world.

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kris_per

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