VB.NET Requires Chilkat v11.0.0+

Mark IMAP Email as Read/Unread (Seen/Unseen)

Demonstrates how to mark emails as read or unread. VB.NET

Dim success As Boolean = False

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

Dim imap As New Chilkat.Imap

'  Connect to an IMAP server.
'  Use TLS
imap.Ssl = True
imap.Port = 993
success = imap.Connect("imap.example.com")
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


'  Login
success = imap.Login("myLogin","myPassword")
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


'  Select an IMAP mailbox
success = imap.SelectMailbox("Inbox")
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


'  Set PeekMode so that downloaded messages are not
'  automatically marked as seen.
imap.PeekMode = True

'  The NumMessages property contains the number of messages 
'  in the currently selected mailbox.
Dim numMsgs As Integer = imap.NumMessages
If (numMsgs = 0) Then
    Exit Sub
End If


Dim email As New Chilkat.Email
Dim i As Integer
For i = 1 To numMsgs
    '  Download each email by sequence number (not UID)
    success = imap.FetchEmail(False,i,False,email)
    If (success = False) Then
        Debug.WriteLine(imap.LastErrorText)
        Exit Sub
    End If


    '  If desired, mark the email as SEEN.  There are two
    '  ways to do it:

    '  1) Set the flag directly by using the sequence number
    '  Indicate that we are passing a sequence number and
    '  not a UID:
    Dim bIsUid As Boolean = False
    '  Set the SEEN flag = 1 to mark the email as SEEN,
    '  or set it to 0 to mark it as not-seen.
    success = imap.SetFlag(i,bIsUid,"SEEN",1)
    If (success = False) Then
        Debug.WriteLine(imap.LastErrorText)
        Exit Sub
    End If


    '  2) Alternatively, we can use the email object.
    '  When an email is downloaded from the IMAP server
    '  Chilkat will add a "ckx-imap-uid" header to the email.
    '  This makes it possible to know the UID associated with
    '  the email.  (This is not the sequence number, which may change
    '  from session to session, but the UID which does not change.
    '  The SetMailFlag method is identical to SetFlag, except
    '  it gets the UID from the ckx-imap-uid header.
    '  For example:
    success = imap.SetMailFlag(email,"SEEN",1)
    If (success = False) Then
        Debug.WriteLine(imap.LastErrorText)
        Exit Sub
    End If


Next

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