Verify your Constant Contact email list
Constant Contact has no SimpleVerifier connector. Export your contacts, verify the CSV, upload the valid file into a fresh list and keep the invalid ones out. Constant Contact's own import caps matter here, so the steps work around them.
The workflow
- In Constant Contact open Contacts, filter by status or list if you want part of it, select a contact and click the Select all contacts link, then Actions > Export selection. Tick the fields and click Export, then download the CSV from your import/export activity.
- Upload the CSV on the verify page, signed in; the first 100 checks are free. The email column is found by its header or contents and every other column is kept.
- When the job finishes, download the valid, risky and invalid files. Each keeps all of your original columns.
- Create a list called Verified in Constant Contact. Keeping verified contacts in their own list means your next campaign sends only to people you checked.
- Go to Contacts > Add Contacts > Upload from file, choose the valid file, match the columns to Constant Contact fields and pick the Verified list on the list-selection step.
- Do not re-upload the invalid file as subscribed contacts. Leave those addresses out, or keep the file as a record of who you removed. Remember that anyone you add must have agreed to receive your mail.
Menu names follow Constant Contact’s own help articles, checked 12 Nov 2026: export contacts, importing and mapping CSV files. Vendors rename menus, so trust what you see on screen if it differs. SimpleVerifier is not a Constant Contact partner and has no Constant Contact connector.
Columns to map
- Email address (or an SMS number); each row needs one of them.
- First name, last name and company only if you use them in merge fields.
- Custom fields must already exist in the account before the upload, so create them first.
What to do with risky and catch-all results
Risky contacts are mainly catch-all domains. Put them in their own list called Risky and send one smaller campaign to it. If the bounce rate on that send is low, merge them into your main list; if not, leave them out.
What people use it for
- Clean a list before a seasonal campaign for a small business or local organisation.
- Check a newsletter list collected on paper sign-up sheets and typed in later.
- Keep a small list of verified contacts for the most important send of the year.
Using the result
Each address comes back valid (the mail server confirmed the mailbox), risky (delivery could not be confirmed: a catch-all domain, a role address such as info@, or a provider that hides mailbox status) or invalid (it will bounce, or it is a throwaway address).
Full endpoint reference, error codes and an OpenAPI file are in the API docs. For lists of thousands of addresses, upload a CSV on the verify page instead.
Comparing tools? See email verifiers for Constant Contact compared, with prices checked on each vendor’s site.
Run your 100 free checks on one list before you switch anything
Export one list’s addresses as a CSV and upload it: the first 100 are checked free in the dashboard, no card needed. Compare the results with what you use now, then decide. Nothing in Constant Contact changes until you import a file back.
Common questions
- Which plans include API access for Constant Contact?
- API access comes with Pro, Business and Agency, listed on the pricing page; Starter covers CSV verification only. A key on a plan without API access gets a 402 that says so. Each key can make 120 calls a minute.
- Do I need an API key to use this?
- No. This workflow is all CSV: nothing connects Constant Contact to SimpleVerifier.
- How large a file can Constant Contact import?
- Constant Contact's API documentation says rows past 40,000 are skipped and files over 4 MB are cut at 4 MB. Check the dashboard uploader's own limit on screen and split the valid file if in doubt.