Graham Trott gt@pobox.com writes:
Any clues would be most welcome.
I know next to nothing about Postfix, but two suggestions:
* check that the #! line on /home/filter/postfix-filter.sh is right; getting this wrong can produce 'No such file or directory' for programs that do exist.
* strace it and see what it is trying to do leading up to that 'No such file or directory' message (look for an ENOENT).