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Problem attaching PDF file using SMTP

pgiusto
pgiusto asked
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Last Modified: 2006-11-17
I have an e-mail client written in C++. I wrote it some years ago, using plain SMTP messages through sockets.
Now I have to attach some PDF files to the message, so I learned all about the MIME thing. It works fine with text files, but I have problems with PDF files.

This are the headers I put on my message:

Mime-Version: 1.0
Content-Type: application/octet-stream; name=xx.pdf
Content-Disposition: attachment; filename=xx.pdf

Next I read the xx.pdf file using fread and send it through the socket.
The message goes to the server and is received by the recipient ok.

When the recipient opens the file (with Acrobat Reader) the file is corrupt. Before each byte with value 0A, "someone" inserted an extra byte with value 0D.

I think the problem is on the message headers, but I can't figure it out.
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Commented:
We get similar problems when people send mails with attachments (using clients such as Outlook, Outlook Express) as html.

When they set their client to "Send as plain text" - attachments are received just fine. Not sure if your client has an html or plain text option - if the latter, select this before sending attachments.

Hope this helps
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