A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : A NULL MX Resource Record means "I never accept email"
Author(s) : M. Delany
Filename : draft-delany-nullmx-00.txt
Pages : 5
Date : 2005-4-6
A common strategy of SMTP servers when deciding whether to accept an
email or not, is to ensure that the 2821.MailFrom contains a domain
willing to accept non-delivery email (aka bounces).
When the 2821.MailFrom domain has a DNS MX Resource Record (RR), it is
making an explicit statement that it is willing to accept
email. However, when the domain has just a DNS A (or AAAA) RR, there
is no such clarity as most hosts on the Internet advertise an A RR
regardless of whether they want to accept email or not.
The NULL MX RR formalizes the existing mechanism by which a domain
communicates that it will never accept email.
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