Guides

Twenty two guides live here, and every one of them is about a decision you make in about four seconds: the form in front of you wants an email address, and you have to decide which address it gets.

That decision looks trivial and usually is. Occasionally it is expensive, and the difference between the two cases is not obvious while you are standing at the form. A discount code and a two factor recovery address arrive through the same box, look identical on screen, and have nothing else in common. These pages exist to make the difference visible before you type, rather than eighteen months later when a password reset has nowhere to land.

Nothing here needs reading in order, and nothing here is theory. Each guide is built around a situation that actually happens: the code has not arrived, the site refused the address, the trial is about to renew, the download wants an address before it will start. If one of those is why you are here, jump straight to it.

Start with what the thing is

If you have never used an address like this before, two pages cover the whole mechanism.

What a temporary email address is explains what happens between clicking generate and the message appearing, including the part most people get wrong: nothing was created in advance, and the mailbox exists only because you asked for it. How long a mailbox lasts puts numbers on the clock, and what happens after it expires explains why an expired address is not simply inactive but genuinely gone, and why that name can end up belonging to somebody else later.

When something has gone wrong

Three guides for the three failures people meet.

The commonest by a distance is silence: the verification code that never arrives. The answer is almost never patience, and the page explains what is actually happening on the sender's side while you refresh.

Second is rejection at the form itself: a site blocked the disposable address. That is a check working as designed rather than a fault, and there are three practical ways past it, one of which most people never try.

Third is the quiet one: the attachment you cannot open, where the file is fine and the account state is the problem.

A fourth arrives late, months after everything seemed settled: the service asks you to confirm your address again and the mailbox it wants to write to no longer exists. That page covers what can still be done and what cannot.

Deciding whether this is the right tool at all

Two pages, and they pull in opposite directions on purpose.

When you should not use a temporary address is the shortest and most valuable page on the site. One question decides it, and getting the answer wrong is how people lose accounts they still needed years later.

Email aliases or disposable addresses covers the middle ground, because the choice is not binary. An alias from your own provider expires when you decide rather than when a cleanup job runs, which makes it the right answer for a whole category of signups that neither a real address nor a throwaway one handles well.

Is temporary email safe answers the question people actually mean when they ask it, which is usually about who else can read the mail rather than about malware.

The situations these addresses were made for

Seven guides, one per common signup, and each says plainly whether a throwaway address is a good idea there.

Free trials and discount codes without the newsletter are the two most popular uses, and both have a trap in them worth knowing before you start. Forums you will visit once is the cleanest case on the whole site: no money, no recovery, nothing to lose. Public wi-fi signups covers the captive portal that wants an address before it will let you read anything. Signing up on a phone is about the mechanics being different in a way nobody warns you about: copy, paste and app switching all conspire against you on a small screen. Developers and testers is the one professional use case, with the honest limits of it. And why every site asks for an address explains the other side of all of this: what the form is for, from the point of view of the company that built it.

Two more situations turn on the same question and answer it differently. Giveaways and prize draws look like the perfect throwaway case until somebody wins: the notification has a deadline measured in hours, and the paperwork that follows needs an address that still exists. Forms that email you the result covers quizzes, quotes and calculators that finish the work and then hold the answer behind an address, including how to tell in a few seconds which of them already has your result sitting in the page.

Getting better at it

Four pages for when the basics are behind you.

Choosing a domain matters more than choosing a name, and the reasons are not obvious: the part before the at sign affects almost nothing, while the part after it decides whether the form accepts you. How to stop spam before it starts is about the habit that prevents the problem instead of managing it. Email privacy basics is the shortest route to understanding what an address reveals about you. And if you want quick answers rather than pages, the questions and answers page is faster than any guide here.

One rule that runs through all of it

If you read nothing else, read this paragraph.

Use a new address for each form, and never point anything you might need to recover at an address that expires. Every guide on this page is a longer version of one of those two sentences, worked out for a specific situation. The first sentence costs you four seconds and saves an inbox. The second costs you nothing at all and saves accounts that people genuinely lose, permanently, every day of the week.