smtp from vb.net console application on pc

I have a vb.net console application I am building with vs 2008 and I cannot get it to send email.

If I send to an email that is on my domain then it sends ok, but if I send to hotmail or any other email it throws an error.

My pc is xp.

I have read all day on google about similar problems people have when sending from their website and obviously they need to use localhost, but that will not fix my problem.

Thanks for any help. I really need this to work.

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Imports System.Net.Mail

Module test_email
Public Function send_email()
Try
Dim Message As MailMessage = New MailMessage()
Dim Smtp As New SmtpClient()
Dim SmtpUser As New System.Net.NetworkCredential()
Message.From = New MailAddress("[email protected]")
Message.To.Add(New MailAddress("[email protected]"))
Message.IsBodyHtml = False
Message.Subject = "3 new, 1 price update"
Message.Body = "this is a test"
SmtpUser.UserName = "[email protected]"
SmtpUser.Password = "password"
SmtpUser.Domain = "mydomain.com"
Message.Priority = MailPriority.Normal
Smtp.UseDefaultCredentials = False
Smtp.Credentials = SmtpUser
Smtp.Host = "smtp.mydomain.com"
Smtp.DeliveryMethod = SmtpDeliveryMethod.Network
Smtp.Port = 587
Smtp.Send(Message)
Catch ex As SmtpFailedRecipientException
LogErrors.WriteError(ex.Message)
Return "fail"
Exit Function
End Try
Return "success"
End Function
End Module
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exception returned:

Mailbox unavailable. The server response was: <[email protected]> No such user here

 

This is the exception that comes back:
----------------------------------------------------------------------
Mailbox unavailable. The server response was: <[email protected]> No such user here
---------------------------------------------------------------------
[email protected] is the address I am sending to...

The funny thing is, that if I send to an email address that is a valid pop3 account on the domain I am sending from, it will send.

However, I need to be able to send email to any email address.

Because I am authenticating the account sending the email, it should work.

Thanks again for anything. I really need this to work.

 

What other authenticating do I have to do beside this:

SmtpUser.UserName = "[email protected]"
SmtpUser.Password = "password"
SmtpUser.Domain = "mydomain.com"


My application is shown in its entirety above.

 

woo hoo!

I finally found the right way to do it. This is working right now, although I have no idea why!

Thanks!

Dim Message As MailMessage = New MailMessage()
Dim Smtp As New SmtpClient()
Dim SmtpUser As New System.Net.NetworkCredential("[email protected]", "password")

Message.From = New MailAddress("[email protected]")
Message.To.Add(New MailAddress("[email protected]"))
Message.IsBodyHtml = False
Message.Subject = "Another test"
Message.Body = "This is a test"
Message.Priority = MailPriority.Normal
Smtp.EnableSsl = False

Smtp.Credentials = SmtpUser
Smtp.Host = "smtp.mydomain.com"
Smtp.DeliveryMethod = SmtpDeliveryMethod.Network
Smtp.Port = 587

Smtp.Send(Message)

 

Far Out Dude!

I just worked for about 2 hours trying to get this to work. Finally gave up and went looking for answers.

Your solution worked for me!

Thanks

Volking

 

I tried the solution given by Dave123 above with 2 differences
1) My domain name and userid/password reflect my domain
2) It was done in c#

I have wraped the code in a try/catch/finally block and am not receiving any errors however I do not appear to get any mail sent... at least none is received.
1) Is there a way to check to see if the messages are waiting for pickup?
2 ) How do i debug an SMTP problem that doesn't give me any error messages?

 

How are you passing the From and To address? If you are passing it as a variable, try hard coding the email address.

 

I hard coded ALL message information and still no Cigar. No errors and no emails.

 

What do you mean by....

1) My domain name and userid/password reflect my domain

What are the values you are inputting? If you are sending through our smtp server you need to input the full email address. Also make sure the smtp server you are using is properly resolving to our mail servers IP address.

 

Post your code.