sourcing output from a program

[Tim Gray]

I'm sure this has been covered before.  I want to source a set of 
aliases that are generated by a program I've written.  Right now I've go 
the following lines in my muttrc:

source `~/bin/script.sh > ~/.mutt/aliases; echo ~/.mutt/aliases`
This seems like a roundabout way to do things.  Is there some way to 
source the output directly instead of dumping it to a file and echoing 
the file name?

Thanks,
Tim