Quoted Printable vs BASE64 attachnments and PDF files

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I ran into a problem where OE encoded a particular PDF file attachment as a
QUOTED-PRINTABLE rather than BASE64.

While the problem was fixed at the receiver Mail Reader software because
this highlight a bug in how it was reading and decoding quoted-printable
MIME content, my question is why OE is using quoted printable for one
particular PDF file and not other PDF files?

The issue developed when someone reported a problem with PDF files he was
generating. He sent me a simple test file - TESTPDF.PDF (attached).

To see if this related to OE settings, I set quoted printable in the MIME
settings (TOOLS | SEND | HMTL Settings and Plain Text Setting.

I then created a message and attached 10 random different PDF files
including this testpdf.pdf. Rather then send it, I saved it as an *.EML
file. Looking at the EML file, all PDF attachments except this TESTPDF.PDF
were saved using BASE64 encoding.

So the question is why this one testpdf.pdf? What is so special about this
TESTPDF.PDF that told OE to use quoted-printable?

Thanks for any input you might be able to provide.

Hector

Attachment:testpdf.pdf
Description: Adobe PDF document

Relevant Pages

  • Re: Quoted Printable vs BASE64 attachnments and PDF files
    ... OE chooses Quoted-printable or Base64 based on the contents of the file. ... Open your PDF files in Notepad and you'll see the difference. ... the only way to force base64 is to zip the file and attach ... > MIME content, my question is why OE is using quoted printable for one ...
    (microsoft.public.windows.inetexplorer.ie6_outlookexpress)
  • Re: Email Attachments are corrupted
    ... It corrupts a much larger number of files. ... Microsoft's previous fix for the Base64 problem was to use UUEncode. ... My server emails out many thousands of pdf files daily. ...
    (microsoft.public.dotnet.languages.vb)
  • Re: Quoted Printable vs BASE64 attachnments and PDF files
    ... binary characters and 85% text, would encode as a smaller attachment ... > one binary character is enough to trigger BASE64 encoding. ... >> Open your PDF files in Notepad and you'll see the difference. ...
    (microsoft.public.windows.inetexplorer.ie6_outlookexpress)
  • Re: Quoted Printable vs BASE64 attachnments and PDF files
    ... one binary character is enough to trigger BASE64 encoding. ... --- Hector ... > OE chooses Quoted-printable or Base64 based on the contents of the file. ... > Open your PDF files in Notepad and you'll see the difference. ...
    (microsoft.public.windows.inetexplorer.ie6_outlookexpress)