blocking mail send/receive from a domain?

[Bill Parker]

Hello All,

        I would like to know how the qmail book is coming along, and
as a side note, I have a domain which is being a PITA in terms of not
wanting to stop one of it's customers from auto mailing...the domain
is email.com, and I would like to block any mail from being sent from
my server and being received by my server...is there an easy way to
do this?

-Bill