@host.somewhere.com

I'm having a hard time finding the right place to hook ruleset 0 in sendmail
8.9.1

The first part of the hook matches "user<@somewhere.com.>",  and calls procmail
passing "user(_at_)somewhere(_dot_)com(_dot_)procmail(_dot_)" .

But when procmail passes the message back to sednmail, I get
"user(_at_)somewhere(_dot_)com(_dot_)procmail@pentagon.somewhere.com" where 
pentagon is the name
of the host that all of this stuff is running on.

Questions: Is procmail adding the "@pentagon.somwhere.com" on before calling
sendmail to pass the message back in?

Is there any place I can learn about the "$@" variable, and how it is built?

Is there a better way to hook into ruleset 0?

Any ideas, help, etc appreciated.

[RC]