is-autoreply (npm): Detect if email is an autoreply according to the email headers.
Keywords: email|autoreply|auto-reply|headers|autoresponse|auto-reponse|autoresponder|auto-reponder|Auto-Submitted|Return-Path|Preference|X-Preference|X-Autorespond|X-Autogenerated|X-AutoReply-From|X-Mail-Autoreply|X-FC-MachineGenerated|X-Autoreply|X-POST-MessageClass|Delivered-To|auto-submitted|delivered-to|return-path|x-autogenerated|x-autoreply|x-autoreply-from|x-autorespond|x-fc-machinegenerated|x-mail-autoreply|x-post-messageclass|x-preference