Outlook 97 - sent messages received with blank body

[NickD]

I use Outlook 97 to send mail to recipients on a mailing
list, but some are reporting that they get a blank message
body. There is no attachment, and the messages are sent
using MIME format, as plain text. Not all recipients have
this problem.

Any ideas? Would using UUENCODE help? If so,. why?

All input gratefully received

Regards

Nick