Guide
Email for sign-ups: how it actually works
One question sits behind every article here: which address to enter at sign-up so the form accepts it and the message arrives. This page is the general answer. The walkthroughs that follow add what each service does differently.
How sites tell disposable mail apart
The server does not know what you plan to do with the address, and cannot find out. It looks at the domain — in three ways, which fire at different moments.
- 01
The domain’s MX record
First and cheapest: has the domain declared where mail should be delivered. A domain without an MX record is rejected instantly, before any message is sent. This is what weeds out addresses invented in the form itself.
- 02
Public disposable-domain lists
The domain is checked against open, community-maintained lists of temp-mail services. A new disposable service lands on them within days of launching — which is why a free service cannot hide: its domain is public by definition, it *is* its shopfront.
- 03
Reputation and deliverability
Even past the first two checks, the message still has to arrive. That is the domain’s SPF, DKIM and DMARC, and its absence from blocklists such as Spamhaus.
None of the three checks is about an address being "temporary". All three are about the domain. So "which email will work" is really the question "which domain".
Four options and where each one ends
What people usually reach for when they need an address to sign up with.
| Option | Price | Lifetime | Domain check |
|---|---|---|---|
| Disposable mail | free | 10 minutes to a day | domain is on the public lists |
| A free provider mailbox | free | while you keep signing in | passes, but often wants a phone number |
| Your own domain and mail server | from $10/year plus a server | while you keep renewing | passes, if everything is configured right |
| A mailbox on someone else’s configured domain | from $0.006 per mailbox per year | the term you choose | passes; the domain is configured and monitored |
The difference between the first and the last is not "temporariness" — it is whether the domain is on the lists and how long the address lives. The price column is rarely what decides it; the last two are.
Signing up for specific services
- Email for a Facebook ad accountHalf of all Meta mail comes from the ad account. Measured across 381,131 messages: what arrives, how much to expect per account, and why "take the code and forget it" fails.
- Email for Facebook and Meta BusinessHalf the mail Facebook sends comes from the ad account, not the personal profile. Measured across 380,826 messages: what arrives, which address works, and how to receive it.
- How to sign up for GitHub with a separate emailWhat GitHub checks in an address, how to receive the verification code, and how to keep your address out of public commit history.
- How to sign up for Discord with a separate emailWhat Discord checks in an address, where to get one that passes, three ways to receive the confirmation, and why the phone number is a separate question.
- How to sign up for PayPal with a separate emailStep by step: where to get the address, passing PayPal's email check, where the phone number fits in, and the mistakes that get new accounts limited.
- How to sign up for Stripe with a separate emailStripe is stricter than most — it filters disposable domains and checks MX records. Which addresses pass, and the full sign-up walkthrough.
- How to sign up for ChatGPT with a separate emailStep by step: what OpenAI checks in an address, where to get one that passes, three ways to receive the code, and what to do when it does not arrive.
Setup and access
- Email for Telegram: what it is actually forTelegram signs you up by phone, not by email. Where email does appear, why that address has to outlive the account, and which one to use.
- IMAP setup in Thunderbird: step by stepHow to connect a mailbox in Thunderbird, Apple Mail or Outlook: host, port, encryption, and the connection errors people trip over.
- Why websites reject temporary email (and what works)Three ways websites detect disposable addresses — and four working alternatives when temp mail gets rejected.
How to receive the mail
Which way suits you depends on how many addresses you have and who they belong to.
- One address and you need a code — open the mailbox in the dashboard: the message is right there and the code is highlighted for copying.
- The mailbox has been handed to someone else — webmail at /mail, signing in with the mailbox address and its own password, no dashboard access needed.
- Many mailboxes, or handing them to a team — a mail client over IMAP: one server for every domain, port 993, SSL/TLS.
Mailboxes receive only. You cannot send from them — and for confirmations and codes you do not need to.
When the message does not arrive
- Less than a minute has passed — delivery is sometimes delayed under load.
- Check the Junk folder inside the mailbox: filters put first-contact mail to a fresh address there more often.
- Check the address for a typo — copy it rather than typing it.
- Requested the code again? Only the latest one works.
- The form rejected the address outright — then nothing was ever sent: take an address on another domain from your order.
What it costs
Prices start at $0.006 per mailbox per year and drop 20% from a hundred, 35% from a thousand and 50% from ten thousand. The term is chosen at checkout — from one year to permanent, which is bound to the domain’s registration. The tiers differ only in how many mailboxes share a domain.
All tiers and terms