Yahoo! IMAP (imap.mail.yahoo.com)

(from Wikipedia)

It is possible to get direct IMAP access without signing up for paid access nor using software like YPOPs! or FreePOPs. Yahoo! operates IMAP and secure IMAP servers (imap.mail.yahoo.com in particular), which are globally accessible. However they require a specific, non-standard IMAP command to be sent before login is done, namely: “ID ("GUID" "1")”.

Download: Chilkat .NET Assemblies

Dim imap As New Chilkat.Imap()

Dim success As Boolean

'  Anything unlocks the component and begins a fully-functional 30-day trial.
success = imap.UnlockComponent("Anything for 30-day trial")
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & imap.LastErrorText & vbCrLf
    Exit Sub
End If


'  Connect to they Yahoo! IMAP server.
success = imap.Connect("imap.mail.yahoo.com")
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & imap.LastErrorText & vbCrLf
    Exit Sub
End If


'  Send the non-standard ID command...
Dim rawResponse As String
rawResponse = imap.SendRawCommand("ID (""GUID"" ""1"")")
If (rawResponse = vbNullString ) Then
    TextBox1.Text = TextBox1.Text & imap.LastErrorText & vbCrLf
    Exit Sub
End If


'  Login
success = imap.Login("myLogin","myPassword")
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & imap.LastErrorText & vbCrLf
    Exit Sub
End If


TextBox1.Text = TextBox1.Text & "Login Success!" & vbCrLf

'  Select an IMAP mailbox
success = imap.SelectMailbox("Inbox")
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & imap.LastErrorText & vbCrLf
    Exit Sub
End If


'  Continue with whatever you wish to do...
'  (see other examples..)

'  Disconnect from the IMAP server.
imap.Disconnect()