Simon Josefsson wrote:
I haven't seen any
arguments that MFT is harmful
It is harmful because it results in an increase in spam; e.g.:
"Hi. This is the qmail-send program at cr.yp.to.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.
<djb-internal/copies(_at_)cr(_dot_)yp(_dot_)to>:
See http://cr.yp.to/docs/copies.html.
--- Below this line is a copy of the message."