The following list contains the 100 most malicious entities detected by the SpamKill network, ranked by their reputation score. This data is updated hourly.
Some are testing stolen email addresses, some are burying a victim's inbox in confirmation emails (a list-bombing attack), and some are simply filling every form they find. Either way your list fills with addresses that never convert and hurt deliverability. See our guide to email list bombing for how the attack works.
Many of the addresses bots use belong to real people whose inboxes are being abused. We mask them so the pattern stays visible for research without exposing a victim's address to further harvesting.
Every email you send to a fake or abused address risks a bounce, a spam complaint, or a spam-trap hit. Mailbox providers score senders on exactly those signals, so a list padded with bot signups gradually pushes your legitimate email toward the spam folder.
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