Maybe:

Let's say you posted a SUBJECT: WEB ARCHIVE QUESTION everyday to
LSTSRV-L.  The following example woud find today's

(sorry for the line-wrap)

http://peach.ease.lsoft.com/scripts/wa.exe?S2=lstsrv-l&q=&s=web+archive+qu
estion&f=&a=today&b=

and this would find both yesterday's and today's

http://peach.ease.lsoft.com/scripts/wa.exe?S2=lstsrv-l&q=&s=web+archive+qu
estion&f=&a=yesterday&b=

It seems to be though, that it might be better for the list-owner to
store the posting as a FILE so that a 'GET fn ft' would retrieve it (at
least through a MAILTO: URL or perhaps just a simple .TXT file URL?).

/Pete