LARTC - Apr 2001 - Incoming Traffic Control across WAN

Hi All

Is it possible to control incoming traffic from the Internet across the WAN
on the company premises side not at the ISP. i.e. If I have a 128Kbps WAN
and some one is trying to send me a 5MB email is possible to throttle him
back to 64Kbps.  Or do u have to have a box @ the ISP which limits traffic
down my WAN.

Thanks in Advance

Steven