I can reproduce the issue on Linux (Fedora F22),
R 3.3.0 patched of today.
Here's code for experimenting which allows to reproduce the
issue without the need for an attached file (there's a temporary
file created and removed as part of the function below) :
##-
Appended is the file -- you need to tell your e-mail software to use
one of the MIME types that R-devel does accept; text/plain
is what I chose
((Yes, as R mailing list server "operator", with a bit of detective work,
I was able to find the "uncleaned" e-mail and extract the
attachment from i