Keep bad addresses off your list.

Every list collects addresses that will never read a word: typos at signup, inboxes people abandoned, throwaway addresses made to grab a download, and role addresses like info@ that a team, or nobody, reads.

They cost you twice. Hard bounces tell mailbox providers you don’t keep your list clean, and addresses that never open drag down the engagement signals Gmail and Outlook use to decide where your mail lands.

A routine that works

1. At signup: catch typos and fake addresses before they’re added. Confirmed opt-in helps most.
2. After every send: remove hard bounces right away.
3. Every few months: find readers who stopped opening, send one re-engagement email, and stop sending to the ones who don’t respond.

The checker above handles the first step for a single address. For a whole list, use your email platform’s bounce handling and engagement data.

What the answers mean

• Looks deliverable. The mailbox provider accepts mail for this address.
• Can’t tell. The provider won’t say whether the mailbox exists. Many large providers answer this way for every address.
• Risky. The address may bounce or may never be read.
• Will bounce. Mail to this address won’t be delivered. Remove it.
• Looks like a typo. The address probably has a mistake in it, and we suggest the domain you likely meant.

We also tell you when an address is disposable, the kind people make once and abandon, or a role address like info@ or sales@, usually read by a team or nobody.