Name: Mail On Deck
Rating: 4.9 (7 reviews)
Author: Mail On Deck

I booked a flight to Portugal last spring. Just one flight. Checked one price comparison site, looked at two airline pages, signed up for one “fare alert” email on a whim.

By the time I landed, that email address had 73 unread messages. Rental car offers. Hotel loyalty programs. Travel insurance pitches. A credit card specifically designed “for explorers.” Three separate emails from a company I’d never heard of selling airport lounge day passes.

The thing is, flight deal alerts and hotel price drop notifications are actually useful. I’m not anti-email-alert. I just don’t want the deal alert bundled with six months of remarketing from every partner brand the OTA (online travel agency) has a revenue share agreement with. Those are two different things, and the travel industry treats them like they’re the same thing.

This post is for the person who wants to set a fare alert for flights to Tokyo, get notified when the price drops below a threshold, grab the deal — and then never hear from that site again. That’s a completely reasonable use case.

So here’s how temp email fits in. Fare alert signups, hotel price watch lists, “notify me when availability opens” forms — basically, these are one-directional. The site needs an address to send the alert to. That’s it. They don’t need your real address. They don’t need to reach you six months from now. They just need an inbox that’s alive right now.

Mail On Deck is exactly that. You generate a temp inbox (takes about four seconds), paste the address into the fare alert form, and the price drop notification lands there. You check it when you want. You ignore it when you don’t.

Okay, where does it break? A few places. If you’re booking an actual ticket — real money changing hands, confirmation codes, boarding pass emails — use your real address. Always. Temp inboxes expire and you do not want your flight confirmation going somewhere you can’t reliably access at 5am in an airport.

And some travel sites — particularly the bigger OTAs like Expedia or Booking.com — do run email domain checks on account creation. If the temp domain is on their blocklist, the signup fails. Honestly, just try a different Mail On Deck domain. The rotation is fast enough that you’ll usually get through on the second attempt.

It’s not a perfect solution. But neither is handing Kayak your primary address and spending three weeks clicking “unsubscribe” on emails from brands you’ve never interacted with.

The Economics Behind Why They Want Your Email

Travel platforms aren’t in the business of finding you cheap flights. They’re in the business of collecting high-intent consumer data and monetizing it. Someone searching for flights to Bali in July is an extremely valuable advertising target — for hotels, rental cars, travel insurance, luggage brands, credit cards, foreign exchange services, and about fifteen other verticals. Your email address, attached to a search pattern that shows exactly where you’re going and when, is worth real money to their ad partners.

That’s why “sign up for fare alerts” is always free and always prominently placed. They aren’t doing you a favor. They’re buying your contact details and behavioral data for zero dollars. The fare alert is the bait. Your inbox is what they’re actually after.

The mistake most people make is creating a full loyalty account with their real email just to access a single feature — like a price watch or a seat notification. You don’t need an account for most of these. A lot of travel sites let you set alerts with just an email address and no account at all (check the small print — there’s usually a “no account? just enter your email” option buried under the main signup form). Use a temp address for that. Save the account creation for when you’re actually booking something.

We tested this at Mail On Deck. Set up 9 fresh temp addresses and signed up for fare alert emails on 9 different travel platforms — a mix of OTAs, airline deal newsletters, and hotel rate trackers. All 9 confirmation emails arrived within 90 seconds. Over the next 14 days, those 9 inboxes received 241 emails combined. Only 38 of those were actual fare alerts or price notifications. The other 203 were promotional — partner hotel chains, rental car upsells, credit card offers, and in one case, a three-email sequence from a travel insurance brand we never signed up with directly.

Airlines and OTAs have entire teams optimizing the email you get after showing travel intent — your inbox is the product, and that’s entirely your problem to solve.