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POModifying the content type of an attachment in a CDO.Message object
 

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  1. POModifying the content type of an attachment in a CDO.Message object
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    <p>When I try to add an MHTML file as an attachment to an email message in VBScript, the <code>ContentMediaType</code> is incorrectly set to <code>"message/rfc822"</code> (<a href="http://tools.ietf.org/html/rfc822" rel="noreferrer">RFC 822</a>). From what I understand, this is correct according to Microsoft, but is incorrect according to <a href="http://tools.ietf.org/html/rfc2557" rel="noreferrer">RFC 2557</a> which states that it should be <code>"multipart/related"</code>. This is a problem, because most (if not all) mail clients interpret <code>"message/rfc822"</code> as an email message. Since the file extensions <code>".mht"</code> and <code>".mhtml"</code> do not match any valid file extension of an email message, the mail client appends one of <code>".msg"</code>, <code>".eml"</code>, etc. to the filename. When a user opens the attachment, it opens as an email message and doesn't display correctly since an MHTML file and an email message are saved differently.</p> <pre><code>Sub SendEmail(FromAddress, ToAddress, Subject, Body, Attachment) Call Err.Clear On Error Resume Next Schema = "http://schemas.microsoft.com/cdo/configuration/" Set Configuration = Sys.OleObject("CDO.Configuration") Configuration.Fields.Item(Schema + "sendusing") = 2 Configuration.Fields.Item(Schema + "smtpserver") = SMTPServer Configuration.Fields.Item(Schema + "smtpserverport") = 25 Configuration.Fields.Item(Schema + "smtpauthenticate") = 1 ' Configuration.Fields.Item(schema + "sendusername") = "" ' Configuration.Fields.Item(schema + "sendpassword") = "" Call Configuration.Fields.Update Set Message = Sys.OleObject("CDO.Message") Set Message.Configuration = Configuration Message.From = FromAddress Message.To = ToAddress Message.Subject = Subject Message.HTMLBody = Body If Not IsEmpty(Attachment) Then 'CDO.Message.AddAttachment doesn't set the correct content media type for an MHTML file. Call Message.AddAttachment(Attachment) End If Call Message.Send End Sub </code></pre> <p>When I run this code, <code>Message.Attachments.Item(1).ContentMediaType</code> is set to <code>"message/rfc822"</code>. I need it to be <code>"multipart/related"</code> if <code>Attachment</code> (a string) ends with <code>".mht"</code> or <code>".mhtml"</code> (case-insensitive). I can do this with the following code.</p> <pre><code>If Len(Attachment) &gt;= 4 And InStr(Len(Attachment) - 3, Attachment, ".mht", vbTextCompare) Or Len(Attachment) &gt;= 4 And InStr(Len(Attachment) - 5, Attachment, ".mhtml", vbTextCompare) Then Message.Attachments.Item(1).ContentMediaType = "multipart/related" End If </code></pre> <p>For some unknown reason, this undefines the attachment from <code>Message.Attachments</code>.</p> <p>I've looked at manually adding the attachment per <a href="http://msdn.microsoft.com/en-us/library/exchange/aa488360%28v=exchg.65%29.aspx" rel="noreferrer">these instructions</a>, but when I call <code>Message.Attachments.Item(1).Fields.Update</code>, the object becomes undefined. I think setting the attachments's <code>ContentMediaType</code>, implicitly invokes it's <code>Fields</code>'s <code>Update</code> method which is what I think is responsible for this unexpected behavior.</p> <p>How can I get around this and send an MHTML file with the <code>"multipart/related"</code> content type while maintaining the proper file extension?</p>
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    1. USIlya Kurnosov
    1. USTyler Crompton
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      1. POModifying the content type of an attachment in a CDO.Message object
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      1. POModifying the content type of an attachment in a CDO.Message object
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    1. CO@IlyaKurnosov, I've tried Microsoft Outlook 2010, Apple Mail (on the iPhone), and my web client (Exchange).
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      1. POModifying the content type of an attachment in a CDO.Message object
      1. USTyler Crompton
    2. COPossibly related: http://stackoverflow.com/questions/31250/content-type-for-mht-files
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      1. POModifying the content type of an attachment in a CDO.Message object
      1. USIlya Kurnosov
 

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