Tried to attach a text file to a letter - mutt showed that it was being
sent as 8bit;iso8859-1 and then the 550s from courier..
550-This message has 8-bit contents, but does not have the necessary MIME
550-headers. Sorry, this mail server does not accept mail without the
550-required MIME headers. See <URL:ftp://ftp.isi.edu/in-notes/rfc2045.txt
550-for more information.
this was found in the actual letter still stuck in the queue:
Content-Type: text/plain; charset=us-ascii
X-Mime-Autoconverted: from 8bit to 7bit by courier 0.28
^---- appears courier's attempt to convert to 7bit failed