E05018 — InboundDomainAlreadyClaimed

HTTP status: <span class="text-code bg-card rounded-sm border px-1 font-mono group-[&amp;]/code-block:rounded-none group-[&amp;]/code-block:border-none group-[&amp;]/code-block:bg-transparent group-[&amp;]/code-block:p-0">422
Type: <span class="text-code bg-card rounded-sm border px-1 font-mono group-[&amp;]/code-block:rounded-none group-[&amp;]/code-block:border-none group-[&amp;]/code-block:bg-transparent group-[&amp;]/code-block:p-0">validation_error
Name: <span class="text-code bg-card rounded-sm border px-1 font-mono group-[&amp;]/code-block:rounded-none group-[&amp;]/code-block:border-none group-[&amp;]/code-block:bg-transparent group-[&amp;]/code-block:p-0">InboundDomainAlreadyClaimed

Another organization is already receiving mail on this domain.

What to do

Pick a different subdomain to receive on. If the domain is yours and you think this is wrong, contact support and we will check who holds it.