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(VB.NET) Reading Unread POP3 EmailThe POP3 protocol cannot determine which emails are "unread," and pure POP3 servers do not store this information. Servers like Exchange Server, offering both POP3 and IMAP interfaces, do contain read/unread data, but it's only accessible through IMAP. Email clients like Outlook and Thunderbird store read/unread statuses on the client side. The example demonstrates using UIDLs to track and manage "unread" emails. Note: This example requires Chilkat v11.0.0 or greater.
Dim success As Boolean = False ' This example requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. ' The mailman object is used for receiving (POP3) ' and sending (SMTP) email. Dim mailman As New Chilkat.MailMan ' Set the POP3 server's hostname mailman.MailHost = "pop.example.com" ' Set the POP3 login/password. mailman.PopUsername = "***" mailman.PopPassword = "***" ' Keep a records of already-seen UIDLs in hash table serialized to an XML file. Dim seenUidlsPath As String = "c:/temp/seenUidls.xml" Dim sbXml As New Chilkat.StringBuilder Dim htSeenUidls As New Chilkat.Hashtable Dim fac As New Chilkat.FileAccess If (fac.FileExists(seenUidlsPath) = True) Then success = sbXml.LoadFile(seenUidlsPath,"utf-8") If (success = False) Then Debug.WriteLine(sbXml.LastErrorText) Exit Sub End If htSeenUidls.AddFromXmlSb(sbXml) End If ' Get the complete list of UIDLs on the mail server. Dim stUidls As New Chilkat.StringTable success = mailman.FetchUidls(stUidls) If (success = False) Then Debug.WriteLine(mailman.LastErrorText) Exit Sub End If ' Build a list of unseen UIDLs Dim stUnseenUidls As New Chilkat.StringTable Dim uidl As String Dim i As Integer = 0 Dim count As Integer = stUidls.Count While i < count uidl = stUidls.StringAt(i) If (htSeenUidls.Contains(uidl) <> True) Then stUnseenUidls.Append(uidl) End If i = i + 1 End While If (stUnseenUidls.Count = 0) Then Debug.WriteLine("No unseen emails!") Exit Sub End If ' Download the unseen emails, adding each UIDL to the "seen" hash table. Dim email As New Chilkat.Email count = stUnseenUidls.Count i = 0 While i < count ' Download the full email. uidl = stUnseenUidls.StringAt(i) success = mailman.FetchByUidl(uidl,False,0,email) If (success = False) Then Debug.WriteLine(mailman.LastErrorText) Exit Sub End If Debug.WriteLine(i) Debug.WriteLine("From: " & email.From) Debug.WriteLine("Subject: " & email.Subject) ' Add this UIDL to the "seen" hash table. htSeenUidls.AddStr(uidl,"") i = i + 1 End While mailman.Pop3EndSession() ' Update the "seen" UIDLs file. sbXml.Clear() htSeenUidls.ToXmlSb(sbXml) success = sbXml.WriteFile(seenUidlsPath,"utf-8",False) If (success = False) Then Debug.WriteLine(sbXml.LastErrorText) Exit Sub End If Debug.WriteLine("Success.") |
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