Thao Nguyen asked,
| I have this problem when using procmail.
| procmail: Executing "formail,-xSubject:"
| /bin/sh: formail: cannot open
| procmail: Assigning "SUBJECT="
| procmail: Executing "formail,-rx,To:"
| /bin/sh: formail: cannot open
Either formail is not in your .procmailrc's $PATH, it is not executable, or
it is not present on your system at all.
Make sure that formail is installed, that it is executable, and that either
(1) early in your .procmailrc you have PATH set to include the directory
where the formail binary is located or (2) you call formail by its full
absolute path instead of just its basename.