POP3: Download Most Recent Email (method 1)

How to ready the N most recent email from a POP3 server.

The POP3 protocol does not provide the ability to request the most recent email, nor does it provide the ability to download email based on read/unread status or any other criteria. The design principle behind POP3 is that it is a temporary holding store for incoming email and email clients or other applications will transfer email from the POP3 server to a local persistent store where it will be managed. Therefore, POP3 does not provide sophisticated functionality (as opposed to IMAP which has the opposite design philosophy: that email is maintained and organized on the server).

This example shows one possible way to retrieve the N most recent emails from a POP3 server. It downloads the headers into a bundle object, then sorts the bundle by date, and finally retrieves the most recent emails by UIDL.

Another alternative is to download the UIDL list and then assume that the 1st N UIDLs are the most recent.

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'  The mailman object is used for receiving (POP3)
'  and sending (SMTP) email.
Dim mailman As New Chilkat.MailMan()

'  Any string argument automatically begins the 30-day trial.
Dim success As Boolean
success = mailman.UnlockComponent("30-day trial")
If (success <> true) Then
    MsgBox("Component unlock failed")
    Exit Sub
End If


'  Set the POP3 server's hostname
mailman.MailHost = "mail.chilkatsoft.com"

'  Set the POP3 login/password.
mailman.PopUsername = "admin@chilkatsoft.com"
mailman.PopPassword = "*myPassword5*"

Dim bundle As Chilkat.EmailBundle
'  Read mail headers and one line of the body.
bundle = mailman.GetAllHeaders(1)

If (bundle Is Nothing ) Then
    MsgBox(mailman.LastErrorText)
    Exit Sub
End If


'  Sort the bundle by date
Dim ascending As Boolean
ascending = false
bundle.SortByDate(ascending)

'  Get the 10 most recent UIDLs
Dim saUidls As New Chilkat.StringArray()
Dim i As Long
Dim n As Long
n = bundle.MessageCount
If (n > 10) Then
    n = 10
End If


Dim email As Chilkat.Email
For i = 0 To n - 1
    email = bundle.GetEmail(i)
    saUidls.Append(email.Uidl)

Next



'  Download in full the 10 most recent emails:
Dim bundle2 As Chilkat.EmailBundle

bundle2 = mailman.FetchMultiple(saUidls)
If (bundle2 Is Nothing ) Then
    MsgBox(mailman.LastErrorText)
    Exit Sub
End If


For i = 0 To bundle2.MessageCount - 1
    email = bundle2.GetEmail(i)
    TextBox1.Text = TextBox1.Text & email.From & vbCrLf
    TextBox1.Refresh()
    TextBox1.Text = TextBox1.Text & email.Subject & vbCrLf
    TextBox1.Refresh()
    TextBox1.Text = TextBox1.Text & "----" & vbCrLf
    TextBox1.Refresh()

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