Download POP3 Email using UIDLs

Demonstrates how to download POP3 email by first getting the complete set of UIDLs and then downloading email by calling FetchEmail for each UIDL. This is equivalent to calling CopyMail, except your application can process each email as it arrives instead of waiting for the entire bundle to be downloaded. Also, it's better protection against potential out-of-memory issues if your mailbox has a very large number of messages. There is no performance difference between fetching emails individually vs. calling CopyMail.

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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 = "myLogin"
mailman.PopPassword = "myPassword"

Dim sa As Chilkat.StringArray

sa = mailman.GetUidls()
If (sa Is Nothing ) Then
    TextBox1.Text = TextBox1.Text & mailman.LastErrorText & vbCrLf
    Exit Sub
End If

Dim i As Long
Dim n As Long
n = sa.Count

Dim email As Chilkat.Email
Dim uidl As String

For i = 0 To n - 1

    uidl = sa.GetString(i)

    email = mailman.FetchEmail(uidl)
    If (email Is Nothing ) Then
        TextBox1.Text = TextBox1.Text & mailman.LastErrorText & vbCrLf
        Exit For
    End If

    TextBox1.Text = TextBox1.Text & email.From & vbCrLf
    TextBox1.Text = TextBox1.Text & email.Subject _
         & vbCrLf & vbCrLf

Next



mailman.Pop3EndSession()