VB.NET - Mark email as read in POP3/IMAP4/EWS/WebDAV¶

Imports System.Globalization
Imports System.Text
Imports System.IO
Imports EAGetMail 'imports EAGetMail namespace

Module Module1

    Function _generateFileName(ByVal sequence As Integer) As String
        Dim currentDateTime As DateTime = DateTime.Now
        Return String.Format("{0}-{1:000}-{2:000}.eml",
                            currentDateTime.ToString("yyyyMMddHHmmss", New CultureInfo("en-US")),
                            currentDateTime.Millisecond,
                            sequence)
    End Function

    Sub Main()

        Dim isUidlLoaded As Boolean = False
        Dim isLeaveCopy As Boolean = True ' leave a copy of message on server

        ' UIDL is the identifier of every email on POP3/IMAP4/Exchange server, to avoid retrieve
        ' the same email from server more than once, we record the email UIDL retrieved every time
        ' if you delete the email from server every time and not to leave a copy of email on
        ' the server, then please remove all the function about uidl.
        ' UIDLManager wraps the function to write/read uidl record from a text file.
        Dim oUIDLManager As UIDLManager = New UIDLManager()

        Try
            ' Create a folder named "inbox" under current directory
            ' to save the email retrieved.
            Dim localInbox As String = String.Format("{0}\inbox", Directory.GetCurrentDirectory())
            Dim uidlFile As String = String.Format("{0}\uidl.txt", localInbox)

            ' If the folder is not existed, create it.
            If Not Directory.Exists(localInbox) Then
                Directory.CreateDirectory(localInbox)
            End If

            Dim oServer As New MailServer("pop3.emailarchitect.net",
                        "test@emailarchitect.net",
                        "testpassword",
                        ServerProtocol.Pop3)

            ' Enable SSL/TLS connection, most modern email server require SSL/TLS connection by default.
            oServer.SSLConnection = True
            oServer.Port = 995

            ' If your server doesn't support SSL/TLS connection, please use the following codes
            ' oServer.SSLConnection = False
            ' oServer.Port = 110

            ' Load existed uidl records to UIDLManager
            oUIDLManager.Load(uidlFile)
            isUidlLoaded = True

            Console.WriteLine("Connecting server ...")

            Dim oClient As New MailClient("TryIt")
            oClient.Connect(oServer)

            Dim infos As MailInfo() = oClient.GetMailInfos()
            Console.WriteLine("Total {0} email(s)", infos.Length)

            ' Remove the local uidl that is not existed on the server,
            oUIDLManager.SyncUIDL(oServer, infos)
            oUIDLManager.Update()

            For i As Integer = 0 To infos.Length - 1
                Dim info As MailInfo = infos(i)

                If oUIDLManager.FindUIDL(oServer, info.UIDL) IsNot Nothing Then
                    ' This email has been downloaded before.
                    Continue For
                End If

                Console.WriteLine("Retrieving {0}/{1}...", i + 1, infos.Length)

                ' Retrieve email from POP3 server
                Dim oMail As Mail = oClient.GetMail(info)

                Console.WriteLine("From: {0}", oMail.From.ToString())
                Console.WriteLine("Subject: {0}" & vbCr & vbLf, oMail.Subject)

                ' Generate an unqiue email file name based on date time.
                Dim fileName As String = _generateFileName(i + 1)
                Dim fullPath As String = String.Format("{0}\{1}", localInbox, fileName)

                ' Save email to local disk
                oMail.SaveAs(fullPath, True)

                If isLeaveCopy Then
                    ' Add uidl to uidl file to avoid we retrieve it next time.
                    oUIDLManager.AddUIDL(oServer, info.UIDL, fileName)
                Else
                    Console.WriteLine("Deleting ...")
                    oClient.Delete(info)

                    ' Remove UIDL from local uidl file.
                    oUIDLManager.RemoveUIDL(oServer, info.UIDL)
                End If

            Next

            ' Quit and expunge emails marked as deleted from POP3 server.
            oClient.Quit()
            Console.WriteLine("Completed!")

        Catch ep As Exception
            Console.WriteLine(ep.Message)
        End Try

        ' Update the uidl list to local uidl file and then we can load it next time.
        If isUidlLoaded Then
            oUIDLManager.Update()
        End If

    End Sub
End Module

Imports System.Globalization
Imports System.Text
Imports System.IO
Imports EAGetMail 'imports EAGetMail namespace

Module Module1

    Function _generateFileName(ByVal sequence As Integer) As String
        Dim currentDateTime As DateTime = DateTime.Now
        Return String.Format("{0}-{1:000}-{2:000}.eml",
                            currentDateTime.ToString("yyyyMMddHHmmss", New CultureInfo("en-US")),
                            currentDateTime.Millisecond,
                            sequence)
    End Function

    Sub Main()

        Try
            ' Create a folder named "inbox" under current directory
            ' to save the email retrieved.
            Dim localInbox As String = String.Format("{0}\inbox", Directory.GetCurrentDirectory())

            ' If the folder is not existed, create it.
            If Not Directory.Exists(localInbox) Then
                Directory.CreateDirectory(localInbox)
            End If

            Dim oServer As New MailServer("imap.emailarchitect.net",
                        "test@emailarchitect.net",
                        "testpassword",
                        ServerProtocol.Imap4)

            ' Enable SSL/TLS connection, most modern email server require SSL/TLS connection by default.
            oServer.SSLConnection = True
            ' Set 993 IMAP SSL Port
            oServer.Port = 993

            Console.WriteLine("Connecting server ...")

            Dim oClient As New MailClient("TryIt")
            oClient.Connect(oServer)

            ' retrieve unread/new email only
            oClient.GetMailInfosParam.Reset()
            oClient.GetMailInfosParam.GetMailInfosOptions = GetMailInfosOptionType.NewOnly

            Dim infos As MailInfo() = oClient.GetMailInfos()
            Console.WriteLine("Total {0} unread email(s)", infos.Length)

            For i As Integer = 0 To infos.Length - 1
                Dim info As MailInfo = infos(i)
                Console.WriteLine("Index: {0}; Size: {1}; UIDL: {2}",
                        info.Index, info.Size, info.UIDL)

                ' Retrieve email from IMAP server
                Dim oMail As Mail = oClient.GetMail(info)

                Console.WriteLine("From: {0}", oMail.From.ToString())
                Console.WriteLine("Subject: {0}" & vbCr & vbLf, oMail.Subject)

                ' Generate an unqiue email file name based on date time.
                Dim fileName As String = _generateFileName(i + 1)
                Dim fullPath As String = String.Format("{0}\{1}", localInbox, fileName)

                ' Save email to local disk
                oMail.SaveAs(fullPath, True)

                ' mark unread email as read, next time this email won't be retrieved again
                If Not info.Read Then
                    oClient.MarkAsRead(info, True)
                End If

                ' if you don't want to leave a copy on server, please use
                ' oClient.Delete(info)
                ' instead of MarkAsRead

            Next

            ' Quit and expunge emails marked as deleted from IMAP server.
            oClient.Quit()
            Console.WriteLine("Completed!")

        Catch ep As Exception
            Console.WriteLine(ep.Message)
        End Try

    End Sub
End Module