My organization owns Internet domains that we no longer strongly use. Web requests typically simply redirect to our main corporate website, and except possibly as described below, there is no legitimate reason for anyone to send mail to addresses at these domains.
I want advice about how to handle email for these domains. I found RFC 7505, which describes using "Null MX" to indicate in DNS MX records that a domain accepts no mail. How does this reconcile with RFC 2142 (1997), which standardizes contact addresses such as abuse@domain, and other, older-school addresses like hostmaster@domain? What is the "good citizen" best practice? Have any Internet luminaries published recommendations?