IMAP STARTTLS (Explicit TLS/SSL)

The StartTls property is set to force the Connect method to automatically convert an connection to TLS/SSL via the STARTTLS IMAP command.

This is also known as "explicit TLS/SSL" as opposed to "implicit TLS/SSL". With implicit TLS/SSL, the IMAP client connects on the well-known IMAP TLS/SSL port 993 and the secure channel is immediately established. With explicit TLS/SSL, the IMAP client connects on the typical non-secure port (143 usually) and the converts the connection via the STARTTLS command.

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
    MsgBox(imap.LastErrorText)
    Exit Sub
End If


'  Indicate that STARTTLS should be used to convert
'  to a secure TLS/SSL connection:
imap.StartTls = true
imap.Port = 143

'  Connect to an IMAP server and convert the connection
'  to TLS/SSL via STARTTLS.
success = imap.Connect("mail.chilkatsoft.com")
If (success <> true) Then
    MsgBox(imap.LastErrorText)
    Exit Sub
End If


'  The remainder of this example is the same as for
'  non-TLS/SSL...

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


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



Dim messageSet As Chilkat.MessageSet
'  We can choose to fetch UIDs or sequence numbers.
Dim fetchUids As Boolean
fetchUids = true
'  Get the message IDs of all the emails in the mailbox
messageSet = imap.Search("ALL",fetchUids)
If (messageSet Is Nothing ) Then
    MsgBox(imap.LastErrorText)
    Exit Sub
End If


'  Fetch the emails into a bundle object:
Dim bundle As Chilkat.EmailBundle
bundle = imap.FetchBundle(messageSet)
If (bundle Is Nothing ) Then

    MsgBox(imap.LastErrorText)
    Exit Sub
End If


'  Loop over the bundle and display the FROM and SUBJECT of each.
Dim i As Long
For i = 0 To bundle.MessageCount - 1
    Dim email As Chilkat.Email
    email = bundle.GetEmail(i)
    TextBox1.Text = TextBox1.Text & email.From & vbCrLf
    TextBox1.Text = TextBox1.Text & email.Subject & vbCrLf
    TextBox1.Text = TextBox1.Text & "--" & vbCrLf

Next

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