Help with "Mailbox unavailable." error

Hi Experts -

I'm trying to send an email via an asp.net script and I'm getting the following error.

Mailbox unavailable. The server response was: 5.7.1 Relaying to <johnsmith@gmail.com> denied (authentication required)

Can someone please tell me what I'm doing wrong?  

PS:  My script ONLY works if I'm sending the message to someone WITHIN my domain.  Anyone on the outside my domain (i.e. HotMail, Gmail, Yahoo, etc.) will throw this error.


' Create the MailMessage instance
        Dim mail As New MailMessage()
 
        ' FROM:
        mail.From = New MailAddress("confirmation@mycompany.com", "Company Solutions")
 
        ' TO:
        mail.To.Add(strEmailAddress)
 
        ' SUBJECT & BODY
        mail.Subject = MailSubject
        mail.Body = mailText
        mail.IsBodyHtml = True
 
        ' Create the SmtpClient object
        Dim smtp As New SmtpClient
 
        '(4) Send the MailMessage (use the Web.config settings)
        smtp.Send(mail)

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cdemott33Asked:
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Geoff BryanDeveloperCommented:
It sounds like you need to provide some specific details to your mail server.

Try adding the 2 new lines shown in the attatched snippet.


 Create the MailMessage instance
        Dim mail As New MailMessage()
 
        ' FROM:
        mail.From = New MailAddress("confirmation@mycompany.com", "Company Solutions")
 
        ' TO:
        mail.To.Add(strEmailAddress)
 
        ' SUBJECT & BODY
        mail.Subject = MailSubject
        mail.Body = mailText
        mail.IsBodyHtml = True
 
        ' Create the SmtpClient object
        Dim smtp As New SmtpClient
'New lines        
 
smtp.Host = "mail.yourdomain.com'
smtp.Credentials = New Net.NetworkCredential(YourLoginName,YourPassword)
 
'to here 
        '(4) Send the MailMessage (use the Web.config settings)
        smtp.Send(mail)
 

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cdemott33Author Commented:
Thanks for your help.  Those articles were helpful
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