(VB.NET) POP3 to SMTP Forwarder

Read a POP3 mailbox and forwards the email to another email address, keeping the recipients in the original email the same.

Note: This example requires Chilkat v11.0.0 or greater.

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Dim success As Boolean = False

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim mailman As New Chilkat.MailMan

' Set the POP3 server's hostname
mailman.MailHost = "pop.example.com"

' Set the POP3 login/password.
mailman.PopUsername = "MY_POP3_LOGIN"
mailman.PopPassword = "MY_POP3_PASSWORD"

' Set the SMTP hostname for sending.
mailman.SmtpHost = "smtp.example.com"
mailman.SmtpUsername = "MY_SMTP_LOGIN"
mailman.SmtpPassword = "MY_SMTP_PASSWORD"

Dim fromAddr As String = "me@example.com"
Dim toAddr As String = "recipient@somewhere.com"

' The the UIDLs for all email in the POP3 mailbox.
Dim stUidls As New Chilkat.StringTable
success = mailman.FetchUidls(stUidls)
If (success = False) Then
    Debug.WriteLine(mailman.LastErrorText)
    Exit Sub
End If


' Just mark messages for delete, then delete at the end.
mailman.ImmediateDelete = False

' Download the email from the server.  Call FetchMimeBd
' because we don't want to load the emails into email objects.
' (We'll delete the emails that are forwarded without error.)
Dim bdMime As New Chilkat.BinData

Dim count As Integer = stUidls.Count
Dim i As Integer = 0
While i < count
    Dim uidl As String = stUidls.StringAt(i)
    Debug.WriteLine("UIDL: " & uidl)

    success = mailman.FetchMimeBd(uidl,bdMime)
    If (success = False) Then
        Debug.WriteLine(mailman.LastErrorText)
        Exit Sub
    End If


    success = mailman.SendMimeBd(fromAddr,toAddr,bdMime)
    If (success = False) Then
        Debug.WriteLine(mailman.LastErrorText)
        Exit Sub
    End If


    success = mailman.DeleteByUidl(uidl)
    If (success = False) Then
        Debug.WriteLine(mailman.LastErrorText)
        Exit Sub
    End If


    i = i + 1
End While

' Delete messages marked for delete.
mailman.ImmediateDelete = True
success = mailman.Pop3EndSession()
If (success = False) Then
    Debug.WriteLine(mailman.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Success.")