lists.example.com
← All inbound domainsDNS status ok
Cached a few minutes — use Re-check after publishing. Unlike outbound, inbound needs an MX pointing at this server.
An MX points at mail.example.org (this server). Other MX values are the domain’s own primaries — they are not an error.
Upstream
Where accepted mail is handed off. Not a mailbox.
MX record to publish
Add this MX so the internet delivers here. Keep any existing primary MX if this is backup-MX.
Valid recipients
Who this domain accepts on port 25. Same idea as an application’s address mode: a list, or any address at the domain.
Unknown recipients are rejected at RCPT so this relay does not generate backscatter.
Every address at this domain is accepted and forwarded. Prefer a list unless the upstream rejects unknowns — otherwise this relay may generate backscatter.
Danger zone
Stops accepting mail for this domain. Does not touch outbound sending domains.