Mail seems to be caching some information about the script, so if you're still having difficulties, please try the following:
1) In OmniFocus preferences, uncheck the "Add Mail Rule"
2) Quit Mail
3) Make sure you're running OmniFocus build 69712 or later.
4) Relaunch OmniFocus
5) Re-check the "Add Mail Rule" in OmniFocus' preferences, and make sure to set the rest of the options on that pane, as they aren't preserved.
6) Quit Mail again (if step 5 launched it)
7) Send yourself an email according to the format you've chosen (-- in subject or +omnifocus in the to)
8) Open mail, make sure it receives mail
9) Look in OmniFocus' inbox for the message
1) In OmniFocus preferences, uncheck the "Add Mail Rule"
2) Quit Mail
3) Make sure you're running OmniFocus build 69712 or later.
4) Relaunch OmniFocus
5) Re-check the "Add Mail Rule" in OmniFocus' preferences, and make sure to set the rest of the options on that pane, as they aren't preserved.
6) Quit Mail again (if step 5 launched it)
7) Send yourself an email according to the format you've chosen (-- in subject or +omnifocus in the to)
8) Open mail, make sure it receives mail
9) Look in OmniFocus' inbox for the message