According to procmail's HISTORY file, procmail-3.12 introduced a new behavior with respect to group-writable .procmailrc files and .procmailrc files located in group-writable directories. Specifically, procmail ignores such a .procmailrc unless GROUP_PER_USER has been defined in config.h at compile-time. The most recent procmail update packages (3.13.1) do not have GROUP_PER_USER defined and fail to function properly on Red Hat Linux systems.
*** Bug 2291 has been marked as a duplicate of this bug. *** According to procmail's HISTORY file, procmail-3.12 introduced a new behavior with respect to group-writable .procmailrc files and .procmailrc files located in group-writable directories. Specifically, procmail ignores such a .procmailrc unless GROUP_PER_USER has been defined in config.h at compile-time. The most recent procmail update packages (3.13.1) do not have GROUP_PER_USER defined and fail to function properly on Red Hat Linux systems.
*** This bug has been marked as a duplicate of 2242 ***