Here's what rhymes with procmail.
male mail nail fail sale pale sail tail tale jail rail veil gale hail shale whale bail email vale wail bale dale pail quail snail hale quale kale grail faille wale scale trail avail entail frail stale assail curtail inhale flail braille gunwale unveil impale lugsail carrell detail prevail travail exhale bewail derail mainsail pigtail foresail monorail wassail pellmell hangnail hightail fingernail ponytail topsail countervail martingale taffrail bobtail nonpareil swallowtail tattletale