Classic ASP Requires Chilkat v11.0.0+
Examine Yahoo Mail IMAP Session Log

To examine the IMAP session log, set the KeepSessionLog property = _TRUE_, and then examine the contents of the SessionLog property.
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success = 0

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

'  See Get Yahoo Mail OAuth2 Access Token for Desktop App 
'  for sample code showing how to obtain a Yahoo Mail access token.

'  In this example, our access token was previously saved to the following file which contains JSON like this:
'  {
'    "access_token": "kCVQdnOdul...LHucA--",
'    "refresh_token": "AIenVXETSo0jklFBVkPS8vVm8E.Ej9ToRG.xDbDYmZ65WIs5t6CZhDrD",
'    "expires_in": 3600,
'    "token_type": "bearer",
'    "xoauth_yahoo_guid": "HGDQCVF5JB4YDOWHITQJFBHCWA"
'  }

set json = Server.CreateObject("Chilkat.JsonObject")
success = json.LoadFile("qa_data/tokens/yahooMail.json")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to load Yahoo Mail access token file.") & "</pre>"
    Response.End
End If

accessToken = json.StringOf("access_token")

'  Do OAuth2 authentication by using the access token as the password in the Login method below...
set imap = Server.CreateObject("Chilkat.Imap")

imap.Ssl = 1
imap.Port = 993

'  Tell Chilkat IMAP to keep a session log.
imap.KeepSessionLog = 1

'  Connect to the Yahoo IMAP server.
success = imap.Connect("imap.mail.yahoo.com")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( imap.LastErrorText) & "</pre>"
    Response.End
End If

'  Indicate that XOAUTH2 authentication is to be used:
imap.AuthMethod = "XOAUTH2"

'  Login
'  Use the email address of the Yahoo Mail account that granted authorization.
success = imap.Login("user@yahoo.com",accessToken)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( imap.LastErrorText) & "</pre>"
Else
    Response.Write "<pre>" & Server.HTMLEncode( "Successfully authenticated with Yahoo IMAP using XOAUTH2!") & "</pre>"
End If

'  Get the list of mailboxes.
refName = ""
wildcardedMailbox = "*"
subscribed = 0

set mboxes = Server.CreateObject("Chilkat.Mailboxes")
success = imap.MbxList(subscribed,refName,wildcardedMailbox,mboxes)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( imap.LastErrorText) & "</pre>"
    Response.End
End If

i = 0
Do While i < mboxes.Count
    Response.Write "<pre>" & Server.HTMLEncode( mboxes.GetName(i)) & "</pre>"
    i = i + 1
Loop

'  Sample output looks like this:

'  Archive
'  Bulk Mail
'  Draft
'  Inbox
'  Inbox/emailsWithAttach
'  Inbox/test
'  Sent
'  Trash

'  Examine the session log
Response.Write "<pre>" & Server.HTMLEncode( imap.SessionLog) & "</pre>"

'  Sample session log

'  ----INFO----
'  Connecting to IMAP server at imap.mail.yahoo.com:993
'  ----IMAP RESPONSE----
'  * OK [CAPABILITY IMAP4rev1 SASL-IR AUTH=PLAIN AUTH=XOAUTH2 AUTH=OAUTHBEARER ID MOVE NAMESPACE XYMHIGHESTMODSEQ UIDPLUS LITERAL+ CHILDREN X-MSG-EXT OBJECTID] IMAP4rev1 Hello
'  ----IMAP REQUEST----
'  aaab AUTHENTICATE XOAUTH2 
'  ----IMAP RESPONSE----
'  aaab OK AUTHENTICATE completed
'  ----IMAP REQUEST----
'  aaac LIST "" "*"
'  ----IMAP RESPONSE----
'  * LIST (\Archive \HasNoChildren) "/" "Archive"
'  * LIST (\Junk \HasNoChildren) "/" "Bulk Mail"
'  * LIST (\Drafts \HasNoChildren) "/" "Draft"
'  * LIST (\HasChildren) "/" "Inbox"
'  * LIST (\HasNoChildren) "/" "Inbox/emailsWithAttach"
'  * LIST (\HasNoChildren) "/" "Inbox/test"
'  * LIST (\Sent \HasNoChildren) "/" "Sent"
'  * LIST (\Trash \HasNoChildren) "/" "Trash"
'  aaac OK LIST completed

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

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