(Visual Basic 6.0) 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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Dim success As Long
success = 0

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

Dim mailman As New ChilkatMailMan

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

' The the UIDLs for all email in the POP3 mailbox.
Dim stUidls As New ChilkatStringTable
success = mailman.FetchUidls(stUidls)
If (success = 0) Then
    Debug.Print mailman.LastErrorText
    Exit Sub
End If

' Just mark messages for delete, then delete at the end.
mailman.ImmediateDelete = 0

' 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 ChilkatBinData

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

    success = mailman.FetchMimeBd(uidl,bdMime)
    If (success = 0) Then
        Debug.Print mailman.LastErrorText
        Exit Sub
    End If

    success = mailman.SendMimeBd(fromAddr,toAddr,bdMime)
    If (success = 0) Then
        Debug.Print mailman.LastErrorText
        Exit Sub
    End If

    success = mailman.DeleteByUidl(uidl)
    If (success = 0) Then
        Debug.Print mailman.LastErrorText
        Exit Sub
    End If

    i = i + 1
Loop

' Delete messages marked for delete.
mailman.ImmediateDelete = 1
success = mailman.Pop3EndSession()
If (success = 0) Then
    Debug.Print mailman.LastErrorText
    Exit Sub
End If

Debug.Print "Success."