How are Amazon gift card winners notified?

By the email address used to enter, which is why the confirmation step matters. A code is normally delivered by email rather than post.

Is there a limit on how many I can enter?

There is no limit across different giveaways. Individual sweepstakes usually limit you to one entry per person per day, and entering more often than the rules allow can disqualify you.

Amazon Gift Card Giveaways

Amazon gift card giveaways are the most common prize online, which cuts both ways: there are more of them, and there are more fakes. The ones below come from companies that pay verified entries. As always, a real giveaway never asks for payment to release a prize.

Questions

How are Amazon gift card winners notified?: By the email address used to enter, which is why the confirmation step matters. A code is normally delivered by email rather than post.
Is there a limit on how many I can enter?: There is no limit across different giveaways. Individual sweepstakes usually limit you to one entry per person per day, and entering more often than the rules allow can disqualify you.

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Before you enter

These are paid listings, so the useful part is knowing what to check before you leave this site.

Named sponsor: A real giveaway names the company responsible for running it. If the entry page hides the sponsor or only uses a famous brand name with no company behind it, treat it as unsafe.
Official rules: The rules should state the prize, approximate retail value, entry period, eligibility, winner selection method and how odds are determined. Missing rules are the strongest reason to walk away.
Free entry: A US sweepstakes must be free to enter. No purchase necessary is a legal requirement, not a courtesy. Any fee to enter or claim a prize disqualifies the listing.