How to schedule periodic bulk rechecks?

Your list doesn't stay the same after you build it. People abandon inboxes, companies go out of business, domains expire and get recycled by spammers. If you built your list two years ago and never ran it through validation since, a chunk of those addresses are already a liability. That's why periodic bulk rechecks exist.

The question isn't whether to recheck. It's how to make it happen without thinking about it every quarter.

How often should you recheck?

A rough rule: run a full list hygiene pass every three to six months. If you send daily or weekly to a large list, lean toward three months. If you send monthly to a small engaged list, every six months is fine. Lists that were partially imported or built before double opt-in became standard deserve a recheck sooner rather than later.

Option 1: Manual but scheduled

The simplest approach. Put a recurring calendar block every quarter. On that day, export your full list (or just the unvalidated segment) as a CSV, upload it to a validation service, and re-import the results. Suppress anything flagged as invalid, risky, or a spam trap. It's not glamorous, but it works if you actually do it.

The catch is that calendar blocks get skipped. You get busy, the quarter slips. That's why more automated options are worth setting up once.

Option 2: No-code automation with Zapier or Make

So if your validation tool has a Zapier integration, you can build a workflow that triggers on a schedule. The basic logic looks like this: every 90 days, trigger an export from your ESP, pass that data to your validation tool, then write results back into your ESP (or a connected spreadsheet for review). Most major validation services have Zapier or Make connectors.

This works well if your list is under around 50,000 contacts and you don't want to write any code. The main limitation: Zapier workflows are not always great at handling large batches, so test with a small segment first.

Option 3: API-based automation

If you or your developer is comfortable with APIs, this is the cleanest long-term setup. Your validation tool's API (most have one) lets you submit a list, poll for results, and pull back statuses programmatically. Combine that with a scheduled job (a cron job, a scheduled Lambda function, or a workflow tool like n8n) and you can run rechecks with zero manual effort.

Now a basic flow looks like this. Schedule a job to run every 90 days. The job pulls your contact list from your ESP via API, submits it to your validation tool, waits for the batch to finish, retrieves results, and then updates contact records with the new validation status. Suppression can be applied automatically based on the returned status codes.

Option 4: ESP-native scheduled segments

Some ESPs let you build dynamic segments based on engagement or contact properties. If your validation tool writes status fields back to your ESP, you can create a segment that automatically collects contacts whose validation status is older than 90 days or who haven't engaged in a certain window. You can then schedule a campaign to that segment (even a suppression update) without any external tooling.

HubSpot and ActiveCampaign handle this kind of property-based scheduling reasonably well. Mailchimp is more limited but can work with tags.

What to check after each recheck cycle

• Did suppression actually fire? Spot-check three to five flagged addresses and confirm they're not in your active send list.
• Did your bounce rate drop in the next send after cleanup? It should. If it didn't, the suppression list wasn't applied correctly.
• Did any new spam trap hits appear? Your deliverability monitoring should catch this, but compare before and after if you have the data.
• How many contacts moved from clean to risky since the last run? A big jump means something changed upstream (domain recycling, role address proliferation, etc.) and you may want to shorten your recheck interval.

The goal of all this is to keep validation and engagement hygiene working together rather than treating them as one-off projects. A list you recheck quarterly and suppress from regularly is a much healthier sending asset than one you clean once and forget.

If you'd like help cleaning your list before setting up a recheck schedule, we do that (hi ;)). Or if you're not sure where to start with the automation, our SOS hotline is free and we'll talk through your specific setup.