"transport returned 127" error

Hello,

I have an alias in my majordomo.aliases that reads like:
nta: "|/path/to/script/mailer.pl"

This alias used to work just fine, piping emails to a little script that stored them in a 
certain directory for future use.

About a month ago, possibly around the time my server was hacked and then 
restored from backup, this stopped working. Now, I get the following in my exim log:

"|/path/to/script/mailer.pl <[email protected]> R=majordomo_aliases 
T=majordomo_pipe: Child process of majordomo_pipe transport returned 127 (could 
mean unable to exec or command does not exist) from command: 
/path/to/script/mailer.pl"

However, no amount of playing around with permissions on the mailer file seems to 
make a difference.  I can make the owner of the file majordomo, and give it 777 
permissions, but I still get the same error.  It execs fine from the command line.

Any ideas would be much appreciated.

Thanks,
Kyala