ZapBounce

ZapBounce and Constant Contact

Constant Contact charges by contact count, which puts a direct price on a dirty list: every dead address is a line on the invoice that will never produce anything.

Their audience skews toward small businesses and nonprofits with older lists, which is the profile that carries the most decay.

You pay monthly for addresses that cannot receive mail

Pricing tiers step up by contact count, so a list padded with dead addresses can push you into a higher bracket for contacts that bounce every time.

Constant Contact removes hard-bounced addresses from future sends automatically, which protects deliverability and does nothing about the billing, because the removal happens after the send.

Lists here are often years old and assembled from paper sign-up sheets and event registrations. That is where the decay concentrates, and it is the segment worth checking first.

How the data moves

  1. Export the contact list as CSV

    Constant Contact exports with custom fields. Those columns come back untouched in the verified file, so the verdict lands beside the contact.

  2. Verify before the next billing cycle

    The point is to remove contacts before they are counted again. Timing the clean before renewal is worth actual money here.

  3. Delete the invalid, keep the rest

    Unlike platforms with archiving, removing a contact here is what reduces the count. Export the removals first so the record survives outside the platform.

  4. Check at sign-up for ongoing hygiene

    Their sign-up forms post to their API. A verification call in front of it catches the typo while the person is still there.

Setting it up

  1. Export every contact list from Constant Contact as CSV, keeping custom field columns.
  2. Verify the files and wait for the completion webhook on each.
  3. Keep a copy of the results file outside the platform as your record of what was removed and why.
  4. Delete contacts marked invalid from Constant Contact, which is what reduces the billable count.
  5. Re-import the remaining contacts with a custom field carrying the verdict.
  6. Put catch-all and unknown contacts on their own list and send to them separately.

Constant Contact: common questions

Will this lower my Constant Contact bill?

If you delete the invalid contacts before the next cycle, yes, by the number removed. Contacts sitting on any list still count.

Should I verify every list or just the old ones?

Start with the oldest and the ones built from paper sign-ups. That is where the invalid addresses concentrate, and the sample will tell you whether the rest is worth doing.

Does Constant Contact verify on import?

It checks address format and removes hard bounces after they happen. Neither one is a pre-send check.

Reference

Check a Constant Contact export today

100 free checks a month, no card. Unknown results and duplicates are never billed.

Get an API keySee pricing