Elmo is a Muppet on the children's television show Sesame Street. He is a furry red monster with googly eyes and an orange nose. He currently hosts the last full segment on Sesame Street, titled Elmo's World, which is aimed at toddlers.
Elmo is a feature-rich console mail client for power users. It integrates functionality commonly realised by separate pieces of software in other mailers and competes with Mutt.