Post #1896131

2024-12-15 15:38 UTC

@Jerry No-email [inbound] domains should also set a "null MX", per RFC7505: https://www.rfc-editor.org/rfc/rfc7505.html MX 0 "."

Replies (1)

@dec23k@mastodon.ie 2024-12-15 19:24

@tychotithonus @Jerry Important: the preference number should be 0. RFC 7505 indicates "no-email" inbound; it's a way for your domain to tell the rest of the world that it does not accept any email from outside. Don't use it on a domain that's supposed to be hosting the email address in a DMARC 'rua' value.

Open ##1896132