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Sending an email using SMTP throws a "Mailbox unavailable. The server response was: Too many invalid recipients" Error

COHFL asked
Last Modified: 2012-06-27
Hi there,
i'm trying to send an email with the code below. The thing is that i keep getting this error "Mailbox unavailable. The server response was: Too many invalid recipients" is there something i'm missing?
I'm using VS 2008
Public Shared Sub SendNotificationEmail(ByVal emailer As String, ByVal MessageSubject As String, ByVal MessageBody As String)

            'create the mail message
            Dim mail As New Net.Mail.MailMessage()

            'set the addresses
            mail.From = New Net.Mail.MailAddress("username@domain.com")'this email address does exist
            mail.To.Add("username@domain.com") 'this email does exits
            'set the content
            mail.Subject = MessageSubject & " " & Now.ToShortDateString
            mail.Body = MessageBody

                'set the server to be used
                Dim smtp As New Net.Mail.SmtpClient("mx1.server.com") 
                'send the message
            Catch ex As Exception
                Throw ex.InnerException
            End Try

        End Sub

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