Sending domains

DKIM, SPF, and return-path.

Sending Domains Inboxes Webhooks

Publish DNS, then check it.

DKIM CNAME and a return-path CNAME. Send stays blocked until both verify. SPF include is optional.

Join waitlist Read the docs

mail.acme.test

send unblocked

DKIM

verified

SPF

verified

Return-path

verified

CNAME

s1._domainkey.mail.acme.test → team-domain.dkim.postshiba.com

CNAME

rp.mail.acme.test → rp.postshiba.com

TXT SPF (optional)

v=spf1 include:spf.postshiba.com ~all

What verify means

Verify means DKIM and the return-path CNAME both pass. We rewrite MAIL FROM to bounce@rp.your-domain so SPF is checked on our zone. There is no DMARC product UI.

Add a sending domain

Publish the records, then check DNS.

Join waitlist Inboxes

About

PostShiba is the transactional email platform that powers Bento behind the scenes. You can build your own products, like Bento, on top of it.

© 2026 PostShiba by Backpack Internet Pty. Ltd. All rights reserved.

The same policies that govern Bento are applied to PostShiba → Privacy | Terms | Security