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In common use, a catchall or catch-all is a general term, or metaphoric dumping group, for a variety of similar words or meanings. For instance, a catch-all taxon a.k.a. "wastebasket taxon" is a grouping of organisms not fitting anywhere else.


In the context of e-mail, a catch-all usually refers to a mailbox on a domain that will "catch all" of the emails addressed to the domain that do not exist in the mail server. Configuring a catch-all address can help avoid losing emails due to misspelling.

For example: if is configured to be the catch-all email address on, then any email sent to an undefined email address will be forwarded to instead of being rejected as an Undeliverable message or Unknown User error. Therefore, if the sender misspelled it "conttact" it would be automatically redirected to the correct address.