ly refers to mangling your e-mail address
so that usenet posts
do not contain a valid e-mail address
Responses which are to be e-mail
to you then require manual intelligent intervention
by the sender
, to de-munge it.
For example, changing the 'sender' in Netscape
to JohnSmith@NOTAREALHOST.com, and placing a note
in your signature
to replace NOTAREALHOST with theRealHost.