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Easily Retrieve Email Information from .EML Files -- Revised

, 30 Apr 2010
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C# classes that upload an EML into a System.Net.Mail.MailMessage

Introduction

This article demonstrates how to upload an EML file into a Microsoft .NET MailMessage. This supercedes other work I have written on this. I had trouble with the other method not decoding the message's HTML body properly and was looking for an alternative when I found Peter Huber's article "POP3 Email Client (.NET 2.0)". I discovered that with a little modification, his RxMailMessage and Pop3MimeClient classes will also read EML files. I contacted him and told him that I would be changing some of his code and updating my article and he was obligated to that idea. Pop3MimeClient was also renamed to MimeReader since its purpose does not necessarily have anything to do with Pop3.

Background

My intent was to have an SMTP service I could send messages to that would process those messages. The recipient email name was an identifier but it was difficult to predict what it might be. The host name was the server. Sending to id@server.com would create an EML file in the SMTP services Drop area (for Microsoft SMTP, usually c:\inetpub\mailroot\drop). I could then pull off all the mail recipients (To, CC and BCC) and process the body message as needed. To use Pop3, I would have had to log in to each Pop3 account or use a Pop3 catch-all account. I was willing to go this route until I found out that Microsoft was going to remove the Pop3 Server from all Microsoft Server platforms after Windows Server 2003. It also seemed a little silly to use Pop3 if I could just find a way to read the EML files directly. Then I found Peter's article.

Using the Code

Let's keep this simple. I'm sure you all know how to get file paths from a directory so I won't bother showing that. It's just a simple matter of creating a MimeReader and using it to get the an RxMailMessage object by specifying the EML path.

MimeReader mime = new MimeReader();     // this class processes the .EML mime content

// this get's the MailMessage into Peter's RxMailMessage class
// which is derived from the MS MailMessage class
RxMailMessage mm = mime.GetEmail(sEmlPath);

I had to look through the MailMessage AlternateViews to find the message body in some cases:

private string GetPlainText(RxMailMessage mm)
{
    // check for plain text in body
    if (!mm.IsBodyHtml && !string.IsNullOrEmpty(mm.Body))
        return mm.Body;
        
    string sText = string.Empty;
    foreach (AlternateView av in mm.AlternateViews)
    {
        // check for plain text
        if (string.Compare(av.ContentType.MediaType, "text/plain", true) == 0)
            continue;// return StreamToString(av.ContentStream);
            
        // check for HTML text
        if (string.Compare(av.ContentType.MediaType, "text/html", true) == 0)
            sText = StreamToString(av.ContentStream);
    }
    
    // HTML is our only hope
    if (sText == string.Empty && mm.IsBodyHtml && !string.IsNullOrEmpty(mm.Body))
        sText = mm.Body;
        
    if (sText == string.Empty)
        return string.Empty;
        
    // need to convert the HTML to plaintext
    return PgUtil.StripHTML(sText);
}

private static string StreamToString(Stream stream)
{
    string sText = string.Empty;
    using (StreamReader sr = new StreamReader(stream))
    {
        sText = sr.ReadToEnd();
        stream.Seek(0, SeekOrigin.Begin);   // leave the stream the way we found it
        stream.Close();
    }
    
    return sText;
}

Points of Interest

Some parts of Peter's original Pop3MimeClient (a.k.a. MimeReader) just didn't seem to work for me, in particular, the setting of content-disposition header field in ProcessHeaderField and the ConvertToMailAddress method.

History

This supercedes the original Easily retrieve email information from .EML files article I had written.

License

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

About the Author

BillJam11
Software Developer (Senior) Lockheed Martin Services Inc
United States United States
No Biography provided

Comments and Discussions

 
QuestionException while reading Outlook eml files -The Date is in invalid format Pinmemberjagnyadatta4-Dec-13 19:09 
AnswerRe: Exception while reading Outlook eml files -The Date is in invalid format PinmemberBillJam115-Dec-13 3:23 
GeneralRe: Exception while reading Outlook eml files -The Date is in invalid format Pinmemberjagnyadatta7-Dec-13 4:35 
QuestionFake code Pinmemberglebbest21-Nov-13 2:48 
Questiongetting warning on build in VS2010; ReplyTo is obsoleted for this type Pinmemberkp52r117-Nov-12 9:16 
AnswerRe: getting warning on build in VS2010; ReplyTo is obsoleted for this type PinmemberMember 899522710-May-13 6:15 
QuestionI am new to .Net and C#: Does anyone have a solution built that i can just open in VS2010? Pinmemberkp52r117-Nov-12 7:45 
QuestionHow to parse and read an eml file? PinmemberMember 872171317-Apr-12 3:47 
AnswerFor save the the attachment pass the attachment to the Function Pinmemberarventh8-Mar-12 22:26 
QuestionAttachment Pinmemberarventh8-Mar-12 19:20 
Questionhow to save the Attachment in the eml on physical path Pinmemberudayakumard8-Mar-12 18:48 
QuestionRequest for the EML messages parser functionality reuse. PinmemberRodion Melnichenko18-Jan-12 0:46 
AnswerRe: Request for the EML messages parser functionality reuse. PinmemberAndreas Gieriet18-Jan-12 3:52 
GeneralMessage Subject PinmemberMember 783491112-Apr-11 6:30 
GeneralPlain text message with attachment problem. Pinmembertkendall10-Mar-11 2:34 
GeneralRe: Plain text message with attachment problem. Pinmembersaurabh.pundir23-Nov-11 21:28 
GeneralRe: Plain text message with attachment problem. PinmemberMember 872171330-Apr-12 22:08 
GeneralRe: Plain text message with attachment problem. Pinmembervp_cz28-Jan-13 2:44 
Generalimages in eml file PinmemberNoel Buenaventura20-Jan-11 19:38 
Thanks for the reply on my previous question. I have last question. I have eml files with images embeded(not attachment). I think this is called inline images. When i try to do convert the eml files to html. Only the text are extracted and the image is not extracted. Thanks for the help.
 
Thanks and regards,
Weng
GeneralRe: images in eml file PinmemberMember 872171330-Apr-12 22:11 
GeneralPgUtil.StripHTML PinmemberNoel Buenaventura18-Jan-11 4:35 
GeneralRe: PgUtil.StripHTML PinmemberBillJam1118-Jan-11 4:54 
Generalinline images and .css PinmembertryingOut28-Sep-10 14:20 
GeneralMy vote of 5 Pinmemberdmdj27-Sep-10 7:07 
Generalattachment Pinmemberdeoganesh_0071-Jul-10 10:02 

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