[imp] Why does imp convert attachments?

[Andreas Geesen]

Hi,

i seem to have severe problems with forwarding messages. My last problem
is on bugs.horde now, but there's another bug(?).

I receive a message with an attached file. That file has got following
headers:

Content-Type: application/octet-stream; name="PWoctet-stream1"
Content-Disposition: attachment; filename="SBLPRODINF.TXT"
Content-Transfer-Encoding: base64

Everything is ok with that file right now, but after forwarding this
mail (to myself on horde/imp) the file has following headers
Content-Type: application/octet-stream; name="SBLPRODINF.TXT"
Content-Disposition: attachment; filename="SBLPRODINF.TXT"
Content-Transfer-Encoding: 8bit
and the text file i download is different from the original file.

They differ in newline sequences. While the original file had '0x0d
0x0a' the forwarded file has '0x0d 0x0d 0x0a' and with every time i
forward the forwarded mail further '0x0d' seem to be inserted.

On the other hand if i try another mail and let it have the following
headers

Content-Type: application/download; name="PWoctet-stream1"
Content-Disposition: attachment; filename="SBLPRODINF.TXT"
Content-Transfer-Encoding: base64

nothing gets changed on forwarding and the attachment keeps sane.

In my opinion the handling of text-files in IMP is seriously ill or my
setup has a major fault which i havent found yet.

I hope someone has a clue to this.

Best regards
    Andreas