“Hitting a spam trap will severely hurt your deliverability and sender reputation, especially with a specific ISP, and could potentially put your IP address on a blacklist, an online database of spammy senders. Once your IP is on a blacklist, you’ll find it awfully difficult to get your emails delivered.”
If you aren’t updating your email list regularly, deleting undeliverable emails and hard bounces, you’re going to want to start. Internet Service Providers (ISPs) have been known to use inactive, deliverable email address in an effort to monitor email traffic that’s not being well cared for. Hit one of these traps and your deliverability and sender reputation can get tarnished.