2001-02-01-11:36:11 Ralf Hildebrandt:
> See the archives. Theoretically it's possible using the content_filter
> mechanism, and a lot of nifty coding.
>
> Easily? No.

With my SMTP proxy framework, it'd mostly be easy; the remaining
issue would be addressing MIME encoding. The harder you want to try
to do it elegantly, the harder it'll get, and the slower it'll run.

It might actually work well enough for practical use if you simply
append the lines, making sure a blank line separates the preceeding
body from your added text if it doesn't already end with one, and
adding a blank line after; I think most MIME decoders are tolerant
of miscellaneous text after the final boundary, and perhaps some may
even display it. For single-part text/plain messages that'll work
fine.

The next simplest thing might be a partial MIME analysis; decide
that you'll only touch single-part text/plain, single-part
anything-else, and multipart/mixed. For the first, just append your
text; for the second, turn it into a multipart/mixed with the
original body as the first part and your attachment as a second in a
text/plain, and for the third, add another text/plain part using the
existing boundary.

In principle you could handle anything, and gracefully, by using
nesting, and for the other types creating a new multipart/mixed
top-level, whose first part has the entire original mime structure
within it, and the second part is your attachment; but I've heard
rumours that some widely-used MUAs might not handle nested MIME so
well.

-Bennett

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