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Simple POP3 Email Class

, 13 Mar 2007
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A simple POP3 class to download emails from a mail server.
Screenshot - ScreenShot.jpg

Introduction

This is a simple class written in VB.NET that allows you to download email from a POP3 mail server. It includes functions for extracting who the mail is for, who it is from, the subject, and the email body. As it stands, there is no support for handling attachments.

Background

When I started to work with the .NET framework, one of the first things I noticed was its lack of support for downloading emails from a mail server. There is very good support for sending mail via the SMTP protocol, but nothing for receiving. The class came about when I needed a way of retrieving log files that were sent as emails and acting on the information contained in the mail.

Using the code

There are two main classes you can use. The first one is called POP3, and is used to connect to the POP3 server and deal with all commands you have to issue in order to retrieve mail. The second class is called EmailMessage, and is used to extract all the different sections out of messages.

You declare the variables and create the objects, like so:

Dim popConn As SamplePop3Class.POP3
Dim mailMess As SamplePop3Class.EmailMessage

'create the objects

popConn = New SamplePop3Class.POP3
mailMess = New SamplePop3Class.EmailMessage

Once you have created the objects, connect to the mail server and find out how many messages (if any) are on the server.

'if we have got to this point, try and connect to the server

popConn.POPConnect(strMailServeor, strUsername, strPassword)

'now we have a connection, see if there are any mails on the server

intMessCnt = popConn.GetMailStat()

Now, the variable intMessCnt will contain how many messages are on the server. If it is greater then 0, loop through each of the messages and extract the sections of the email.

'if we returned some messages, loop through each one and get the details

For i = 1 To intMessCnt

    'load the entire content of the mail into a string

    strMailContent = popConn.GetMailMessage(i)

    'call the functions to get the various parts out of the email 

    strFrom = mailMess.ParseEmail(strMailContent, "From:")
    strSubject = mailMess.ParseEmail(strMailContent, "Subject:")
    strToo = mailMess.ParseEmail(strMailContent, "To:")
    strBody = mailMess.ParseBody()

next i

Now, you should have all the sections of the email held in your variables. From here, you could save the email to an external file, insert the details into a database, or do whatever you want with the information.

Points of interest

This was the first time I have ever tried to write an application that involved communicating over TCP/IP. I was very surprised how easy and powerful it is, the hardest part was making sure I handled any errors coming back from the POP3 server correctly, but as everything coming back into an IOStream, it was very easy to read.

The only problem with this code as it stands is its lack of support for attachments. I have looked into it and it does seam very complex, but I am going to have a go at it and will update this code once I have it working.

Please note this is my first posting, so if anyone has any pointers on how to improve my article, let me know!

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Luke Niland

United Kingdom United Kingdom
I currently work at for a newspaper group in Lancashire(U.K) in the IT dept. I deal with a quite a few different IT system on a day to day basis. My programming experience includes vb6, asp.net, sql and some C++. Check my blog out at beakersoft.co.uk.
 
I have also recently started writing software with a couple of guys i work with, check out our website at www.we3soft.com

Comments and Discussions

 
Questiondoes this work in zimbra? PinmemberMember 104358523-Jun-14 16:20 
QuestionGood News!! Visual Studio now has support for POP3, SMTP, IMAP, etc. PinmemberTino Fourie21-Feb-14 10:00 
Questionunread emails PinmemberMember 104943835-Jan-14 0:51 
GeneralMy vote of 5 PinmemberMadness Fading21-May-13 17:40 
SuggestionThis is cool but I found more... Pinmemberscarterszoo9-Oct-12 17:05 
GeneralMy vote of 5 PinmemberEricoCanales11-Sep-12 12:17 
QuestionDo you have it in C#? Pinmembereveniza30-Jul-12 18:09 
Questionhey luke need help urgently Pinmemberakash89838-Apr-12 18:58 
i got an error
A connection attept failed because the connected party did not properly respond after a period of time, or established connection failed bcoz connected has failed to respond 173.194.79.108:110
plz hhelp me soon
Questioni got this error Pinmemberzhtway8-Aug-11 12:56 
QuestionCan someone give me a sample for hotmail??? PinmemberSteef43525-Jul-11 0:58 
AnswerRe: Can someone give me a sample for hotmail??? PinmemberLuke Niland25-Jul-11 9:40 
Generalbase64 decoding PinmemberRamsin1-Jul-09 11:13 
GeneralRe: base64 decoding PinmemberLuke Niland9-Jul-09 8:06 
GeneralRe: base64 decoding Pingroupjseph8816-Jan-13 16:04 
GeneralSSL/Pop3 Support in this Demo PinmemberLuke Niland30-Mar-09 9:50 
GeneralA problem occured while decoding a base64 email. PinmemberYueming Wu22-Feb-09 1:44 
GeneralRe: A problem occured while decoding a base64 email. PinmemberLuke Niland22-Feb-09 5:28 
GeneralRe: A problem occured while decoding a base64 email. PinmemberYueming Wu22-Feb-09 15:39 
GeneralRe: A problem occured while decoding a base64 email. PinmemberLuke Niland23-Feb-09 8:12 
QuestionRe: A problem occured while decoding a base64 email. Pingroupjseph8816-Jan-13 16:02 
QuestionIt's not working with GMAIL. Can anyone help me? It could be a SSL problem? Pinmemberitamar.locatelli@gmail.com28-Jan-09 3:19 
AnswerRe: It's not working with GMAIL. Can anyone help me? It could be a SSL problem? PinmemberLuke Niland2-Feb-09 8:23 
GeneralRe: It's not working with GMAIL. Can anyone help me? It could be a SSL problem? Pinmemberw3rm24-Mar-09 6:08 
GeneralRe: It's not working with GMAIL. Can anyone help me? It could be a SSL problem? PinmemberLuke Niland25-Mar-09 7:41 
GeneralRe: It's not working with GMAIL. Can anyone help me? It could be a SSL problem? Pinmembercstrader23227-Mar-09 2:54 

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