A common worry is that checking a list might "use up" the addresses or hurt your standing with email providers. It does not.
We never send a real message
To find out if a mailbox exists, we have a quiet, behind-the-scenes conversation with the receiving mail server — the same first step any mail server takes before accepting a message. We stop before any actual email is delivered. Your contacts never see anything, and nothing lands in their inbox.
Why this protects you
- No messages are sent, so there is nothing to bounce during a check.
- Your contacts are not disturbed.
- Your sending reputation is not affected by checking.
Tip
In fact, checking your list before you send is one of the best ways to protect your reputation — it removes the bad addresses that would have bounced.
Did this help?
If you still have a question, we are happy to help.