Don't leave
domains unresolved-
Let defunct resolve your domain required
example.com 300 IN A 34.36.101.120 ; recommended for all domains and subdomains example.com 300 IN ALIAS a.defunct.website ; alternative to an A record if your provider supports ALIAS example.com 300 IN MX 1 a.defunct.email ; we can accept email, too! -
Configure your defunct domain's behaviour optional
example.com 300 IN TXT defunct.https=always ; never | optional | always | only example.com 300 IN TXT defunct.mode=auto ; auto | light | dark example.com 300 IN TXT defunct.theme=default ; default | status | nocontent | blank example.com 300 IN TXT defunct.statuscode=410 ; any valid status code (see httpstatuses.io) example.com 300 IN TXT defunct.redirect=https://example.net ; absolute or relative URL (respects statuscode if 301, 302, 307 or 308)