How can bots harm my email list and reputation?

Imagine you run a newsletter signup form and overnight it gets hit by a bot. By morning, hundreds of new "subscribers" have joined. The problem is most of them aren't real people. Here's what happens next, and why it matters.

Fake addresses spike your bounce rate. Bots often submit addresses that don't exist. When you send your next campaign, those addresses bounce immediately. A bounce rate above 2% starts making your ESP nervous. Above 5%, you risk having your account flagged or suspended. ESPs like Mailchimp or Klaviyo track this automatically and they don't ask questions before acting.

Some submissions are spam traps. Certain bot submissions aren't just fake. They're spam traps planted by blocklist operators like Spamhaus. Hitting even one can land you on a blocklist. The damage is wildly disproportionate to a single address because blocklist placement affects how every mailbox provider treats your mail, not just for one send.

Real people get emailed without their consent. Bots also submit real addresses belonging to people who never signed up. When those people receive your email, they don't recognize you. They hit "mark as spam" because that's the easiest way to make you stop. Complaint rates above 0.1% are enough for Gmail to start routing your mail to the spam folder. Above 0.3% and you're in serious trouble.

The compounding effect is the real danger. High bounces lower your reputation score. Spam trap hits trigger blocklisting. Unsolicited sends drive complaints. These three problems feed into each other, and once your sender reputation drops, recovering it takes months of careful sending.

If you think bots have already hit your list, a clean before your next send is worth doing. We can help with that at RME Clean. And if you want to stop bots before they get in, the next step is looking at prevention.