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Visual Basic.NET Example SSL connection encrypts data between the email component and POP3 server or IMAP4 server to protect user, password and email content in TCP/IP level. Now this technology is commonly used and many email servers are deployed with SSL such as Gmail, Yahoo and Hotmail. There are two ways to deploy SSL on email server: 1. Using STARTTLS or STLS command to switch SSL channel on normal port (POP3: 110 or IMAP4: 143); 2. Deploying SSL on another port (POP3: 995 or IMAP4: 993 you may query it from your server administrator) directly.
The following example codes demonstrate how to retrieve email over TLS connection from IMAP4 server. This sample downloads emails from IMAP4 server and deletes the email after the email is retrieved.
Code:
' The following example codes demonstrate retrieving email over TLS connection from IMAP4 server
' 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("imap.emailarchitect.net", _
"test@emailarchitect.net", "testpassword", ServerProtocol.Imap4)
Dim oClient As New MailClient("TryIt")
' Enable SSL Connection
oServer.SSLConnection = True
' Set 143 IMAP4 Port
oServer.Port = 143
' Set TLS connection type
oServer.SSLType = SSLConnectType.ConnectTLS
Try
oClient.Connect(oServer)
Dim infos As MailInfo() = oClient.GetMailInfos()
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)
' Receive email from IMAP4 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 email file name based on date time.
Dim d As System.DateTime = System.DateTime.Now
Dim cur As New System.Globalization.CultureInfo("en-US")
Dim sdate As String = d.ToString("yyyyMMddHHmmss", cur)
Dim fileName As String = [String].Format("{0}\{1}{2}{3}.eml", _
mailbox, sdate, d.Millisecond.ToString("d3"), i)
' Save email to local disk
oMail.SaveAs(fileName, True)
' Mark email as deleted from IMAP4 server.
oClient.Delete(info)
Next
' Quit and pure emails marked as deleted from IMAP4 server.
oClient.Quit()
Catch ep As Exception
Console.WriteLine(ep.Message)
End Try
End Sub
End Module
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