Inbox

NO SIGNUPINSTANT INBOXAUTO-EXPIRES

Get a temp email.Keep yours
private.

Create a temporary email instantly

Receive messages and verification codes without sharing your primary email address.

Create temp email

Ready instantly. No signup.

  • Auto OTP detection
  • Auto email refresh
  • No account needed
  • Auto expiration

Built for speed. Designed for privacy.

How MailOnce works

Your temporary email in three simple steps.

  1. 01

    Create your temporary email

    Choose your name before @, select a domain, or get an instant random email. No signup required.

  2. 02

    Receive messages automatically

    Emails, OTP codes, and verification links appear automatically. No refresh needed.

  3. 03

    Protect your real email

    Keep your personal email private with MailOnce for signups, verifications, and websites you don't fully trust.

Your temporary email and inbox expire after 1 hour. Need more time? Extend them up to 3 hours.

Why MailOnce

Everything you need. Built for real privacy.

Powerful features that give you full control of your temporary inbox without slowing you down.

01

Custom address

Choose your name. Pick your domain.

Create an email address that fits you and select from secure, available MailOnce domains.

Explore custom email addresses

Create your address

Make it memorable or keep it random.

Your temporary email

yourname
mailonce.org
mailonce.org
mailonce.net
getmailonce.com
mailonce.email
This domain is available
Link another device Encrypted request

20s

Active for 60 seconds
mailonce.org

Open this inbox?

A scanned device is requesting real-time access to your current inbox.

Same inbox, real-time updates

You stay in control

RefuseAccept
02

Secure device linking

Open the same inbox on your phone.

Scan a rotating QR code, then approve or refuse the browser request before another device gets access.

How secure device linking works
03

Smart detection

OTP codes and verification links, detected for you.

MailOnce surfaces codes and links in context, so you can copy or open the important action instantly.

How OTP and link detection works
Inbox2 new messages

Your verification code

service@site.com

10:24 AM

Code detected

482 731
CopyShow message

Verify your email address

no-reply@website.com

10:22 AM

Verification link detected

https://website.com/verify/email

Open linkShow message

Change temporary email?

Your current email and inbox will no longer be accessible after this action.

CloseYes, change email
Have a problem? Let us know
04

Safe email change

Change your email without accidental loss.

A clear confirmation step warns you before replacing your address and losing access to its inbox.

Learn about changing temporary emails

No sign-up

100% free to use

Auto expiration

Inbox expires automatically

Real-time updates

New emails appear instantly

Private by design

Your data stays temporary

Fast & simple

Built for speed and simplicity

Guides

Practical guides

Practical answers, useful context, and guidance to help you understand temporary email and use MailOnce with confidence.

View all guides

Start here

GUIDE 01

What is a temporary email — and what actually happens after you use one?

Know what a temporary email is, how it works, why people use one, and when a short-lived inbox is the wrong choice.

What it isHow it worksWhen not to use
Explore the guide

OTP & verification

GUIDE 02

Using a temporary email for OTP codes? Here's what happens to the code.

See how OTPs and verification links reach a temporary inbox, why a code can arrive late, and how MailOnce surfaces the action you need.

OTP deliveryLate codesVerification links
Explore OTP & verification

Temp email vs alias

GUIDE 03

Temporary email or email alias — which one should you actually use?

Both can protect your real address, but they solve different problems. Compare how they work, what they keep, and when each option makes more sense.

PrivacyDifferencesWhen to use
Compare the two

FAQ

Find the issue. Get the answer.

Choose the topic closest to what you need. Each category reveals focused questions and short, practical answers.

Choose a category

Frequently asked questions

The essentials of how MailOnce works.