Use a hosted inb address, or point MX at inbound.your-domain. Do not MX the sending domain.
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inb4f2c@inbound.postshiba.com
no DNS required
Domain inbox
agent@inbound.acme.test
MX
inbound.acme.test → inbound.postshiba.com
Needs MX. Do not MX the sending domain.
An approved team with an active shared cluster can receive mail. Retention defaults to 7 days. Poll it, or send it to a webhook. Plus-addressing maps agent+thread@ to thread_id=thread.
PostShiba is the transactional email platform that powers Bento behind the scenes. You can build your own products, like Bento, on top of it.