Email & notification APIs
MailOnce
Temporary email for verification messages and OTP codes in a browser-scoped, auto-expiring inbox
- 0community votes
- 2DR by Ahrefs −1 (down) since last check
Ahrefs Domain Rating listed 6 Nov 2026, relisted 6 Nov 2026.
A temporary email service that provides auto-expiring inboxes for receiving verification codes, OTP messages, and confirmation links without sharing your
What it is
MailOnce: the homepage
MailOnce is a focused temporary-email service for short-lived messages, verification codes and confirmation links. It exists to give people a practical buffer between a one-off online task and their primary inbox.
The service allows users to create a temporary email instantly without signup, choose a custom name or random address, and receive messages automatically with real-time updates. MailOnce features automatic OTP and verification link detection, secure device linking via QR code approval, and inboxes that expire automatically after one hour, extendable up to three hours.
The product is designed around practical privacy principles: useful features before impressive ones, clear lifecycle boundaries, and security claims tied to implemented controls. MailOnce is built by an independent developer and serves users who need a buffer for signups, product trials, downloads, and test flows without exposing their primary email address.
Listed capabilities
- Instant temporary email creation without signup
- Auto-expiring inbox after one hour, extendable to three hours
- Automatic OTP code detection and copying
- Verification link detection and opening
- Custom email address selection
- Secure device linking with QR code approval
- Real-time message delivery without manual refresh
- Multiple domain options for custom addresses
- Safe email change with confirmation step
Pricing
Pricing model: Free
Follow MailOnce for an email about each milestone, update and new product they post, in a daily summary.
MailOnce metrics
| Metric | Value |
|---|---|
| Domain Rating | 2 −1 (down) since last check |
| Trust Flow | 4 no change since last check |
| Citation Flow | 22 no change since last check |
| Referring domains | 10 no change since last check |
| External backlinks | 114 no change since last check |
Ahrefs Domain Rating listed 6 Nov 2026, relisted 6 Nov 2026. Listed under topic: Recreation (4). Majestic listed 25 Oct 2026, relisted 25 Oct 2026. Link data listed by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
MailOnce domain listing data
Show the listing data
| Domain age | 3 months |
|---|---|
| Registered | |
| Expires | |
| Registrar | HOSTINGER operations, UAB |
| DNSSEC | Not signed |
MailOnce launch receipt entry
| Measure | At launch, then latest |
|---|---|
| Domain Rating (Ahrefs) | 3 to 2 −1 (down) since launch 25 Oct 2026, then 6 Nov 2026 |
| Trust Flow (Majestic) | 4 first measured 25 Oct 2026 |
| Referring domains (Majestic) | 10 first measured 25 Oct 2026 |
Day 11 since launch. Next receipt: day 30, 24 Nov 2026. We show what changed, not what caused it: many things affect these numbers. Nothing here is estimated.
Before you launch
The playbook on SaaS Directory List lists what to prepare, what to post on launch day and where else to list your product.
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Quick answers
How long does a MailOnce temporary email last?
Your temporary email and inbox expire automatically after 1 hour. If you need more time, you can extend it up to 3 hours total.
Do I need to create an account to use MailOnce?
No, MailOnce requires no account creation. You can create a temporary email instantly and start using it right away.
Can I access the same inbox on multiple devices?
Yes, you can open the same inbox on another device by scanning a rotating QR code and approving the browser request. You stay in control and can refuse access.
What happens to my messages when the inbox expires?
Messages and the inbox expire and are no longer accessible after the lifecycle expires. This is by design for privacy protection. Do not use a temporary inbox as the only recovery address for important accounts.
Is MailOnce appropriate for all types of email needs?
No, temporary email is not suitable for every account. You should decide whether a temporary address is appropriate for a particular service. Do not rely on MailOnce for high-risk, emergency, regulated or long-term access where continuity is essential.
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