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ivan  
#1 Posted : Tuesday, April 12, 2011 5:13:05 AM(UTC)
ivan

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Visual Basic.NET Example

In an ASP/ASP.NET email application, if email download takes longer than the timeout value (in seconds) that the current asp page is allowed to run, user will get an error "ASP Timeout". This often happens when user has a large quantity of emails to download or user downloads emails via a slow connection. By default the timeout is set to 90 seconds, it is easy to exceed this limit.

Obviously, a solution to ASP timeout is to set ASPScriptTimeout a larger value. You may click here for details. Technically the timeout problem can be solved in this way; however, some users may get frustrated and press the stop button on the browser toolbar as he waits too long.

EAGetMail POP3 Component introduces a more intelligent method to retrieve emails in background. You should download the EAGetMail Service installer and install it on your machine at first. Then you can use MailClient.GetMailsByQueue method to send the request to EAGetMail Service, the method returns to the user immediately and the EAGetMail Service performs task in background.

To run the following example, you also need to download EAGetMail Service and install it on your machine.

Code:

' The following example codes demonstrate downloading email from POP3 server in background
' To get full sample projects, please download and install EAGetMail on your machine.
' To run it correctly, please change email server, user, password, folder, file name value to yours

Imports System.IO 

' Imports EAGetMail namespace
Imports EAGetMail 

Module Module1 
    Sub Main() 
        ' Create a folder named "inbox" under current directory
        ' to save the email retrieved.
        Dim curpath As String = Directory.GetCurrentDirectory() 
        Dim mailbox As String = [String].Format("{0}\inbox", curpath) 

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

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

        ' If your POP3 server requires SSL connection,
        ' Please add the following codes:
        ' oServer.SSLConnection = True
        ' oServer.Port = 995

        Try 
            ' Leave a copy of message on server.
            Dim leaveCopy As Boolean = True 

            ' Download emails to this local folder
            Dim downloadFolder As String = mailbox 

            ' Send request to EAGetMail Service, then EAGetMail Service retrieves email
            ' in background and this method returns immediately.
            oClient.GetMailsByQueue(oServer, downloadFolder, leaveCopy) 
        Catch ep As Exception 
            Console.WriteLine(ep.Message) 
        End Try 
    End Sub 
End Module 

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If you have any comments or questions about above example codes, please add your comments here.
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