Authenticate through SMTP

This is driving me crazy! I've been able to relay through my office SMTP server, but I can't use vb.net to authenticate properly through my mailserver at home. I use Kerio Mailserver and my whole family relays through it, but I can't get vb to do it. Here's a sample --

Dim MailClient As New System.Net.Mail.SmtpClient

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Me.MailClient.Host = "xxxx.xxx"

Me.MailClient.Port = "25"

Dim MyCred As New System.Net.NetworkCredential("[email protected]", "xxxxxxx")

MailClient.UseDefaultCredentials = False

MailClient.Credentials = MyCred

MailClient.Send("[email protected]", "[email protected]", "[Test]- VB App", "VB App")

End Sub

Now, when I try to send an email to a email address on the mailserver, it works fine. But when trying to send to for example, a Gmail or Yahoo account, it will not - says 'Cannot Relay'. Yes, the user I'm authenticating with does have permission to relay....

Thanks!

Brandon

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Scott Lysle20y ago
Brandon:

Just to be clear, on your local instance of IIS, have you set the smart host property to point to this mail server (right click the Default SMTP Virtual Server icon, select properties, select the Deliver tab, then click the "Advanced" button to show the dialog). You did not mention this in your posting so I wanted to ask that first.

Scott Lysle