Why Use a Custom Domain with Temporary Email?
Generic disposable email addresses like [email protected] are easy to spot and often blocked by websites. With a custom domain, your temporary inboxes use a real domain you own — making them indistinguishable from permanent addresses while keeping all the privacy benefits.
Key Benefits
- Bypass disposable-email blocklists
- Professional appearance for QA & testing
- Full control over your domain reputation
- Unlimited catch-all addresses on your domain
- Same auto-expiry and privacy as standard inboxes
How to Set Up Custom Domains on OpenInbox
Getting started takes less than five minutes. Here is the full process:
Add Your Domain
Go to Settings → Domains and enter your domain name (e.g. yourdomain.com).
Configure DNS Records
Add the MX record and DKIM CNAME records shown in the dashboard to your domain registrar.
Verify Ownership
Click "Verify DNS" — OpenInbox checks your records and activates the domain within minutes.
Create Inboxes
When creating a new inbox, select your verified domain from the dropdown — done!
Security & Privacy
Custom domain inboxes inherit every privacy safeguard that standard OpenInbox addresses enjoy:
- Emails are automatically deleted when the inbox expires
- HTML is sanitized — scripts, tracking pixels, and external images are stripped
- DKIM verification ensures deliverability and prevents spoofing
- No email content is ever shared with third parties
Use Cases
QA & Staging Environments
Test email flows with realistic-looking addresses instead of generic temp-mail domains.
Freelancer Client Projects
Spin up project-specific inboxes on your own domain — look professional, stay disposable.
SaaS Onboarding Testing
Create dozens of unique addresses under one domain to simulate real user signups.
Privacy-First Browsing
Sign up for services with your domain so nothing traces back to your personal email.
Which Plans Support Custom Domains?
| Plan | Custom Domains | Emails / Month |
|---|---|---|
| Free | — | — |
| Starter ($3/mo) | 1 | 5,000 |
| Pro ($7/mo) | 3 | 25,000 |
| Business ($15/mo) | 10 | 100,000 |
Ready to Use Your Own Domain?
Upgrade to any paid plan and connect your first custom domain in under five minutes.
View Plans