Public Wi-Fi Signups

position: 22

You connect to the network, a page appears, and it wants an email address before it will let any traffic through. This is one of the clearest cases for a disposable address, because the exchange is entirely one sided.

What the network actually wants

Sometimes a legal requirement to identify users, which an unverified address satisfies only nominally.

More often, a marketing list. Airport lounges, cafes, hotels and shopping centres sell or use the addresses collected at the login page. Some send their own offers, others pass the list to whoever supplied the network hardware, and a few do both.

Occasionally nothing at all. The captive portal software asked for a field, so somebody enabled it, and the addresses go into a database nobody looks at.

In none of these cases does the network need to reach you again. You want twenty minutes of connectivity, not a relationship.

The practical problem

Here is the awkward part, and it catches people out: you often cannot receive mail until you are already online.

Networks vary. Some let you through immediately after you submit the form. Others send a code to the address you gave and expect you to enter it, which requires the connection you do not yet have.

If the network sends a code, check whether it lets any traffic through before verification. Many allow the login page's own domain and nothing else, in which case a disposable address will not help unless you have mobile data to read it on. With mobile data available, open this site there, get an address, submit it, read the code, and enter it in the browser on the other device.

Making it easy

Get the address before you need it. If you are travelling and know a captive portal is coming, open this page while you still have a connection and copy the address. It stays valid for hours.

Choose your own name. An address you can retype from memory is genuinely useful when the portal is on a laptop and the mail is on a phone.

Do not use a real address out of habit. Portal forms are among the most carelessly handled databases in existence, and the addresses collected there end up in unexpected places.

What a disposable address does not fix

It does nothing about the network itself. Public networks are shared, the operator can see traffic metadata, and other users may be doing things you would rather not be adjacent to.

Use encrypted connections, which almost everything is by default now. Avoid signing into anything sensitive on a network you do not control. If you do this often, use a VPN.

The address protects your inbox. It has no opinion about your traffic.

A note on hotel networks

Hotels are the worst offenders because they usually already have your real address from the booking, and the network form asks for it again anyway to feed a different system. Giving that second form a disposable address costs you nothing at all: the hotel can still reach you through the booking, and the marketing database gets an address that stops existing tomorrow.