VBScript

Fetch a Set of POP3 Messages by UIDL

Demonstrates the Chilkat MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are listed in a StringTable and appends them to an EmailBundle. The arguments are the UIDL StringTable, headersOnly, numBodyLines, and the EmailBundle. This example fetches two specific messages by UIDL.

Background: This is the efficient way to download a selected subset of a mailbox in one call — exactly the pattern for an incremental client: list the mailbox UIDLs, compare against the ones you've already stored, and fetch only the new UIDLs as a set. It avoids re-downloading messages you already have while still pulling everything new in a single operation.

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VBScript

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

'  Demonstrates the MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are
'  listed in a StringTable and appends them to an EmailBundle.  The arguments are the UIDL
'  StringTable, headersOnly, numBodyLines, and the EmailBundle.  The messages remain on the
'  server.

set mailman = CreateObject("Chilkat.MailMan")

'  Configure the POP3 server connection.
mailman.MailHost = "pop.example.com"
mailman.MailPort = 995
mailman.PopSsl = 1
mailman.PopUsername = "user@example.com"
mailman.PopPassword = "myPassword"

'  Build the set of UIDLs to fetch.
set uidls = CreateObject("Chilkat.StringTable")
success = uidls.Append("0000000123abcdef")
success = uidls.Append("0000000124abcdef")

'  Fetch the listed messages (full bodies) into a bundle.
'  headersOnly=0 (fetch the entire message).
'  Note: numBodyLines only applies when headersOnly is 1 (it sets how many lines of the
'  body to include along with the headers).  When headersOnly is 0, the entire message
'  is fetched and numBodyLines is ignored.
set bundle = CreateObject("Chilkat.EmailBundle")

success = mailman.FetchUidlSet(uidls,0,0,bundle)
If (success = 0) Then
    outFile.WriteLine(mailman.LastErrorText)
    WScript.Quit
End If

n = bundle.MessageCount
outFile.WriteLine("Fetched " & n & " messages.")

set email = CreateObject("Chilkat.Email")

For i = 0 To n - 1
    success = bundle.EmailAt(i,email)
    outFile.WriteLine(email.Subject)
Next

'  Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
'  connects and authenticates -- using the property settings above -- whenever a server
'  operation requires it.  Calling the explicit connect/authenticate methods can still be
'  helpful to determine whether a failure occurs while connecting or while authenticating.

outFile.Close