substituing $1 one time but not the other

Hello

I want to get the name of a mail file using its message ID.
I 'm using :
grep '^Message-ID: <my id>$' myfolder/* | awk -F ':' '{print $1;}'
and it work fine.
now i want to put this line in a shell script with 2 params: myid and
myfolder

so :
grep '^Message-ID: <$1>$' $2/* | awk -F ':' '{print $1;}'

but it does not work because of the awk argument 'print $1 ' .
the command line is substitued by
grep '^Message-ID: <myid>$' myfolder/* | awk -F ':' '{print myid;}'

how can i tell the shell to not substitute the print $1 ?????



.

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