Lars-Johan Liman wrote:

> This can possibly boil down to the old e-mail standard for the
> "mailbox" format - the old local storage format for incoming mail to a
> user (typically in /var/(spool/)mail/liman (in my case). In those
> files, messages are separated by a "From ...." line (no colon! not
> header!), and in order to not mistake a text line starting with "From
> " for a message separator, all "From " lines in a message had to be
> "quoted", typically with a ">" leading to text like this:

Yest that must be indeed the source of the problem, thanks for your
explaination.

> One way around this could be to see whether you can append your Python
> code as something else than "text/plain", and have it encoded in
> Quoted-Printable (or even BASE64), which ought to eliminate the
> problem. (Q-P encoding would lead to "From ..." --> "=70rom ...", if I
> remember the standard correctly, which I probably don't ;-).

The body of the mbox file I attached to my reply to Adam is encoded in
quoted-printable.

Christoph