> for i in `ls kernel.*`; do 
>   cat $i | /usr/lib/sendmail linux-kernel at lists.real-time.com;
>   sleep 5s; 
> done

find . -type f -maxdepth 1 -name kernel.\* -exec cat {} \| 
/usr/lib/sendmail linux-kernel at lists.real-time.com \;

Not sure if the escape on the pipe is right, but find is your underrated 
friend.