(Visual Basic 6.0) Read IMAP Email Headers

Call FetchHeaders to download only the email headers.

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 imap As New ChilkatImap

' Connect to an IMAP server.
' Use TLS
imap.Ssl = 1
imap.Port = 993
success = imap.Connect("imap.example.com")
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

' Login
success = imap.Login("****","****")
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

' Select an IMAP mailbox
success = imap.SelectMailbox("Inbox")
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

' Get the message IDs of all the emails in the mailbox
' We can choose to fetch UIDs or sequence numbers.
Dim fetchUids As Long
fetchUids = 1
Dim messageSet As New MessageSet
success = imap.QueryMbx("ALL",fetchUids,messageSet)
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

' When downloading headers, each email object contains
' (obviously) the headers, but the body will be missing.
' Also, attachments will not be included.  However, it is
' possible to get information about the attachments
' as well as the complete size of the email.
Dim bundle As New ChilkatEmailBundle
Dim headersOnly As Long
headersOnly = 1
success = imap.FetchMsgSet(headersOnly,messageSet,bundle)
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

' Loop over the email objects and display information
' about each:
Dim email As New ChilkatEmail
Dim name As String
Dim addr As String
Dim i As Long
i = 0
Dim j As Long
j = 0
Do While i < bundle.MessageCount
    success = bundle.EmailAt(i,email)

    ' Display the From and Subject
    Debug.Print email.From
    Debug.Print email.Subject

    ' Display the recipients:
    j = 0
    Do While j < email.NumTo
        Debug.Print "TO: " & email.GetToName(j) & ", " & email.GetToAddr(j)
        j = j + 1
    Loop
    j = 0
    Do While j < email.NumCC
        Debug.Print "CC: " & email.GetCcName(j) & ", " & email.GetCcAddr(j)
        j = j + 1
    Loop

    ' Show the total size of the email, including body and attachments:
    Debug.Print email.Size

    ' When a full email is downloaded, we would use the
    ' email.NumAttachments property in conjunction with the
    ' email.GetMailAttach* methods.
    ' However, when an email object contains only the header,
    ' we need to access the attachment info differently:
    Dim numAttach As Long
    numAttach = imap.GetMailNumAttach(email)
    j = 0
    Do While j < numAttach
        Debug.Print imap.GetMailAttachFilename(email,j)
        Dim attachSize As Long
        attachSize = imap.GetMailAttachSize(email,j)
        Debug.Print "    size = " & attachSize & " bytes"
        j = j + 1
    Loop

    Debug.Print "--"
Loop

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