variants: or auto-responder or less commonly auto responder \ ˌȯ-​tō-​ri-​ˈspän-​dər How to pronounce auto responder (audio) \
plural autoresponders or auto-responders also auto responders

Definition of autoresponder

: a function of e-mail software that automatically sends a response to incoming messages Unanswered e-mail is as big a turnoff as unanswered calls. Consider using your ISP's autoresponder to acknowledge received e-mail. It lets the visitors know their message arrived and gives you an opportunity to thank them for visiting the site.— Victoria Hall Smith, PC World, January 1999

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Other Words from autoresponder

auto-response or less commonly auto response or less commonly autoresponse \ ˌȯ-​tō-​ri-​ˈspän(t)s How to pronounce autoresponse (audio) \ noun, plural auto-responses also auto responses also autoresponses
You can let people know you are out of the office via greeting on your voicemail and an autoresponse to e-mail. Slate Magazine, 13 Apr. 2009

First Known Use of autoresponder

1995, in the meaning defined above

History and Etymology for autoresponder

auto- entry 1 + responder

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Time Traveler for autoresponder

The first known use of autoresponder was in 1995

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