Forty Freebies, One Clean Inbox: A 90-Day UK Spam Diary

Free samples, discount clubs and competition sites are the internet’s answer to a pub quiz: cheap to enter, weirdly compelling and rarely quite as good as they look. In July 2026 I decided to find out what the bill actually is — not in cash, but in inbox clutter. I set up a fresh address on a domain I control, gave it to 40 UK-facing freebie sites over eight days, and logged every message for 90 days.

No aliases, no plus tags, no filtering rules. I wanted the raw experience. I did use a separate browser profile and never handed over bank details. The address looked ordinary: a normal name at a normal .co.uk domain. The sign-ups were a mix of sample portals, discount clubs, competition pages and newsletter pop-ups promising money off. I ticked only the boxes I had to tick, though several sites made that harder than it should have been.

The setup: one clean inbox, no safety net

The point was not to prove that freebies cause spam. Anyone who has entered a ‘win a £500 supermarket voucher’ competition already suspects that. The point was to see the shape of it: how quickly it starts, which senders are responsible, and whether the volume tails off or simply changes costume. I kept a spreadsheet of arrival times, subject lines, sender domains, unsubscribe headers and whether the message landed in the inbox or junk folder.

By day 90 the address had received 1,384 messages. Junk filtering caught 1,097 of them, about 79%. The other 287 reached the inbox. That is not a disaster by raw numbers, but it is a useful reminder that filtering is doing heavy lifting — and that a less well-defended inbox would have had a much noisier time.

Days 1–7: the polite phase

The first week produced 23 messages. Most were welcome emails, confirmation links and ‘here is your 10% off’ notes. Sender domains generally matched the brands I had signed up with. A few asked me to add them to my contacts so future offers would not be missed. Nothing looked obviously shared yet.

This is the honeymoon period, and it is worth recognising. A clean address does not stay clean just because the first week is quiet. The interesting part starts when the welcome sequence ends and the list-sharing begins.

Weeks 2–4: the first list-sharing twitch

By the end of week four the total had reached 210 messages. The jump was not gradual. One sample site shared my address with ‘carefully selected partners’ within 36 hours of sign-up, despite the privacy policy being vague enough to double as a yoga instruction. I started seeing the same address arrive at senders I had never heard of, often with subject lines that referenced the original freebie.

One competition portal produced 14 messages in three days. A discount club sent four near-identical ‘exclusive’ offers from four different display names, all using the same tracking domain. The content was not sophisticated. The volume was.

Weeks 5–8: the competition spiral

This was the peak. Weeks five to eight added 604 messages, with week six alone accounting for 219. Competition sites dominated. The subject lines were a predictable cabaret: ‘final call’, ‘winner alert’, ‘your entry expires tonight’, ‘last chance to claim’. Several senders rotated display names while using the same infrastructure and a generic Midlands PO Box in the footer.

This is where the freebie economy shows its true shape. The sample or discount is the hook; the competition entry is the data capture; the follow-up email is the product. Some of these senders were legitimate bulk marketers. Some were sloppy affiliates. A few were clearly testing how much noise an address would tolerate before the recipient disengaged.

Weeks 9–13: the long tail

The final stretch added 570 messages. Volume fell from the peak but the tone sharpened. ‘We miss you’ and ‘is this goodbye?’ arrived alongside voucher-expiry warnings and re-engagement quizzes. By day 90, 16 senders accounted for 61% of everything received. That is the bit people miss: spam from freebie sign-ups is not always a thousand random strangers. It is often a small number of persistent list operators plus a long tail of affiliates.

What the headers told me

A few technical patterns stood out. Many legitimate bulk senders included List-Unsubscribe headers, and some supported one-click opt-out. Others used a mailto address that required a reply. A handful routed unsubscribe clicks through redirect chains that ended on a preference centre asking for an email address and password — for an account I had never created. That is not a preference centre; that is a phishing form wearing a lanyard.

I also saw how quickly a ‘clean’ address becomes a known address. The moment one list traded it, the same address started appearing in unrelated campaigns. At Spamdex we often talk about sender reputation, but recipient reputation matters too: once your address is on a shared list, it is no longer yours alone.

The rules I would use now

If you are tempted by a freebie, treat the email address as part of the price. My rules after this experiment:

• Use an alias or subaddress for anything involving competitions, samples or discount clubs. If your provider supports plus-addressing, use a different tag for each site so you can see who leaks it.
• Never use your bank, work, government or main personal address for a freebie. The risk is not just clutter; it is account-recovery confusion and phishing that arrives pre-personalised.
• Read the consent wording. Under UK GDPR, consent should be affirmative and specific, but plenty of sites still nudge you toward ‘selected partners’. If the privacy policy mentions ‘carefully selected third parties’ without naming categories, assume sharing.
• Watch the first 72 hours. If the welcome email has no proper company identity, registered address or clear unsubscribe route, expect trouble.
• Set filters early. Keywords such as ‘winner’, ‘claim’, ‘expires’ and ‘final call’ catch a surprising amount of competition sludge without blocking normal retail mail.
• Unsubscribe from senders you recognise and no longer want. Do not engage with the ones you do not recognise; report them as junk instead.

The bottom line

A freebie is rarely free. Sometimes the cost is £3.99 postage. Sometimes it is 1,384 emails in 90 days and an address that has been passed around like a plate of biscuits at a village hall. If you want the sample, use a disposable address and keep your real inbox out of it. Your future self will thank you — probably while deleting a ‘final call’ email from a competition you do not remember entering.