Custom receiving domains

Collect on inbound.your-domain. Do not MX the sending domain.

A domain-bound inbox collects on inbound.{sending_domain}, not on the sending domain. The sending domain must already be verified.

MX

Publish MX on the inbound host only. Point it at CAPSULE_INBOUND_MX. The inbox page shows the exact record, for example inbound.mail.example.com MX 10 inbound.postshiba.com.

• Do not put PostShiba MX on the sending domain itself. That would steal the domain's existing mailbox mail.
• Catch-all local_part * is allowed only when a sending domain is set. The address is *@inbound.{sending_domain}.
• Hosted inboxes skip MX. They use CAPSULE_INBOUND_ZONE and stay mx_status=not_required.

Queue another MX check from the inbox page or POST /api/v1/inboxes/:id/verify.

Related docs

• Receiving emails
• How do I avoid MX conflicts?
• Add and verify a domain