A working address can still be a spam trap

A spam trap is an address used to observe unwanted email. It can accept a message successfully, which is why a positive verification result doesn't rule it out.

Trap addresses can be created for that purpose, arise from common typing mistakes, or use mailboxes that were abandoned and later repurposed. Spamhaus explains these categories and the collection problems they expose.

An SMTP response doesn't announce that an address is a trap. Treat promises to remove every trap with caution.

Work on how addresses enter and stay on the list

Use a confirmation step for subscriptions. A form alone can receive mistyped addresses, bot submissions or someone else's email. A confirmation step reduces those risks; it isn't an absolute guarantee.

Carry forward unsubscribes and delivery suppressions. Review inactive contacts using more than open tracking. Don't assume a purchased or unexplained list becomes suitable for mailing after verification.

These habits matter more than trying to identify one secret address.

If a provider or blocklist operator reports a trap problem, pause the affected campaign and investigate the source of those contacts. Follow the operator's guidance. Removing a suspected row and immediately restarting leaves the collection problem in place.

Verification can find some bad addresses. Keep using it for that job, without treating the result as a certificate that the list is safe to send to.