Re-formatting email line breaks

I’m trying to re-flow email messages, removing the line breaks that
get added by mail programs so that the lines don’t exceed 72 characters. and Thunderbird seem to insert a space character before each
added line break.
Outlook replaces new lines in the email with double \n’s, then uses
single \n’s for the ‘soft’ line breaks.

Can anyone confirm this / point me to some specification / point out
any other client behaviour I need to handle?

Thanks for any help,
RFC 3676: The Text/Plain Format and DelSp Parameters

        - dan

Dan K. mailto:[email protected] tel:+1-415-233-1000

Perfect - thanks

Perfect - thanks