Here is the output.
cat /tmp/get_aliases_result | /usr/libexec/courier/aliascombine > /tmp/aliascombine_result aliascombine: ERR: No such file or directory
Well, that's where the problem is. You should have a utility called strace or truss that logs system calls. For strace, use:
strace -s 8192 -o aliascombine.log /usr/libexec/courier/aliascombine >/tmp/aliascombine_result
pgp00000.pgp
Description: PGP signature
