Disposable Email Guides

Twenty guides live in this section, and not one of them explains how to use the mailbox itself. That part needs no manual: an address is already running on the front page, it starts accepting mail the moment you copy it, and messages show up without you refreshing anything. What needs explaining is the machinery around the address, because that is where people get caught out.

These are written from an unusual position. Running a service like this one means watching the other side of the field at work: the validation vendors, the volunteers who maintain blocklists, the signup forms that quietly stop accepting a domain we put into rotation two months ago. Most writing on this subject comes either from companies selling address validation, whose interest points one way, or from throwaway services promising an invisibility nobody can deliver. Ours points somewhere else, and being useful matters more here than being flattering.

Every guide opens with a short summary in bold, so ten seconds are enough to tell whether it answers your question. The headings inside are questions as well, and the first sentence under each heading answers it outright. Nothing important is saved for the last paragraph.

The four groups below run from general to specific. Start with the first if the vocabulary is still fuzzy. Go to the second if a form has just refused you, or if you run a site and are deciding whether to refuse others. Browse the third if you have one concrete situation to solve tonight. Read the fourth when you want to know how the underlying machinery behaves. If you would rather have short answers than long ones, the questions and answers page covers much of the same ground a few lines at a time.

Terms and the landscape

Disposable, temporary, throwaway, burner: the words get thrown around as if they named one thing. They do not. Behind them sit at least three separate technologies with different owners, different lifespans and different ways of failing you, and picking the wrong one is how people lock themselves out of accounts. This group sorts the vocabulary out and finishes with the money question, because who pays for a free inbox decides what happens to the mail inside it.

• What Is a Disposable Email Address? - five names for one idea, three technologies underneath, and who actually controls the address in each case.
• Burner Email Addresses - the word covers four separate needs, and only three of them have a working answer.
• Email Masking and Relay Services - Apple, Firefox, DuckDuckGo and the password managers all forward to your real inbox, and each one breaks somewhere different.
• How Free Disposable Email Is Paid For - four business models behind a free inbox, the signals that reveal which one you are using, and the one this site runs on.

Detection and the website's side

Detection is the part of this category nobody likes writing about, so it is the part we cover most closely. These four guides serve two audiences at once: the person whose address was just refused, and the developer deciding whether to refuse. It is the same mechanism seen from opposite ends. We stand on the refused end, which is exactly why the arguments in favour of blocking are set out here in full instead of being waved away.

• How Disposable Email Detection Works - six layers of checking, from a text file of domain names to behavioural scoring, described by the side that gets caught by them.
• Disposable Domain Blocklists - who writes the public lists, how a domain ends up on one, and why asking to be taken off leads nowhere.
• Should a Website Block Disposable Email? - the real reasons to block, the signups it costs you invisibly, and the measures that work better than a domain list.
• When Validation Blocks Real People - company catch-alls, young domains and plus addressing all look disposable to a validator, and the customers you lose this way never write in to complain.

Situations where the question comes up

Six scenarios, each with the same shape: what happens to an address after you hand it over, where a throwaway one genuinely helps, and where it quietly costs you something. The dividing line is almost always time. If a message you will need might arrive weeks from now, a mailbox measured in hours is the wrong tool, and each guide says so about its own scenario rather than burying the warning in a footnote somewhere else on the site.

• Marketplaces and Classified Ads - selling one item should not leave a stranger holding your permanent address, plus the scam mail that follows a listing.
• Gated Downloads and Webinars - what a lead form is really buying, why work addresses get checked by domain, and how long a webinar recording takes to arrive.
• Betas, Waitlists and Early Access - invitations turn up months later, which is precisely what a mailbox measured in hours cannot survive.
• Job Boards and Recruiters - where a throwaway address protects a job search, and where it costs you the interview.
• Devices That Demand an Account - the hardware outlives the mailbox you registered it with, and a factory reset asks for the address that no longer exists.
• Second Accounts - which second accounts are ordinary, which get both of them banned, and how services link accounts without looking at the address at all.

Mechanics, safety and the law

The last six go under the surface: what our own infrastructure records and what it does not, what a legal request can actually reach, what a leaked database does with an address for years afterwards, and how to read the headers of a message claiming to come from your bank. One of them describes the do-it-yourself route, which for some readers is a better answer than this service, and saying so costs us nothing worth keeping.

• Can a Disposable Address Be Traced? - what our server keeps, what the site you signed up to already knows about you, and where a court order can and cannot go.
• Is Disposable Email Legal? - legal nearly everywhere, while breaking a site's own rules is a different matter with different consequences.
• Reading Email Headers - the sender name is decoration, and five header fields are where the evidence actually lives.
• Your Own Catch-All Domain - a domain plus a catch-all mailbox gives you unlimited private addresses, with the yearly cost and the spam that eventually comes with them.
• What a Breach Does With Your Address - your address is the key that joins one leaked database to the next, and what changes when it expires before the leak happens.
• Spam Traps and Recycled Addresses - abandoned addresses get reissued as traps, which is the real reason signup forms are nervous about throwaway mail.