How to Connect ActiveCampaign with MailerCheck (2026)

Why Connect ActiveCampaign with MailerCheck

ActiveCampaign is a marketing automation and CRM platform that combines email marketing, sales automation, and customer experience tools. MailerCheck is an email verification service that validates email addresses to identify invalid, disposable, and risky contacts before you send campaigns. Connecting ActiveCampaign with MailerCheck is one of the most impactful integrations for email marketers because it directly protects your sender reputation, reduces bounce rates, and improves deliverability for every campaign you send.

High bounce rates damage your email sender reputation and can cause your ActiveCampaign emails to land in spam folders. By verifying your contact lists through MailerCheck, you ensure that your carefully crafted automation sequences and campaigns reach real, active email addresses.

What This Integration Does

An ActiveCampaign-MailerCheck integration enables:

• Bulk verify your entire ActiveCampaign contact list or specific segments through MailerCheck to identify and remove invalid addresses.
• Automatically verify new contacts as they are added to ActiveCampaign through forms, imports, or API connections.
• Tag or segment contacts in ActiveCampaign based on their MailerCheck verification status (valid, invalid, risky, disposable, unknown).
• Exclude unverified or risky contacts from automation workflows and campaigns to protect deliverability.
• Monitor list health over time by tracking the percentage of valid addresses across your ActiveCampaign lists.

Native vs Third-Party Integration

MailerCheck is developed by the team behind MailerLite and does not have a native, built-in integration with ActiveCampaign. However, connecting them is straightforward through several methods.

The simplest approach is a manual bulk verification workflow: export your ActiveCampaign contacts as a CSV, upload them to MailerCheck for verification, and re-import the cleaned list back into ActiveCampaign with tags indicating verification status. This works well for periodic list cleaning.

For automated ongoing verification, Zapier, Make, or n8n can connect the two platforms. Zapier supports ActiveCampaign as both a trigger and action app, and MailerCheck can be accessed through its API via webhook or HTTP actions. Make provides dedicated modules for both platforms, enabling more complex workflows. n8n offers a self-hosted option for teams that want to keep contact data within their own infrastructure.

Step-by-Step Setup

Step 1: Export Your ActiveCampaign Contacts

In ActiveCampaign, navigate to Contacts and select the list or segment you want to verify. Click Export and download the contacts as a CSV file. Make sure the export includes the email address field and any tags or custom fields you want to preserve.

Step 2: Upload to MailerCheck

Log into MailerCheck and go to the Verify section. Click Upload List and select your exported CSV file. MailerCheck will automatically detect the email column. Start the verification process. For large lists, this may take several minutes to a few hours depending on list size.

Step 3: Download and Review Results

Once verification is complete, download the results file from MailerCheck. The file will include each email address with its verification status: valid, invalid, risky, disposable, role-based, or unknown. Review the summary statistics to understand your list health.

Step 4: Clean Your ActiveCampaign List

Back in ActiveCampaign, take action based on the results. The recommended approach is to create tags for each verification status and apply them to contacts. Go to Contacts > Import and upload the verified list, mapping the MailerCheck status to a custom field or tag. Then create segments that exclude contacts tagged as "invalid" or "disposable" from your active campaigns and automations.

Step 5: Set Up Ongoing Verification

For continuous list hygiene, create an automation in Zapier or Make that triggers when a new contact is added to ActiveCampaign. The workflow sends the email address to MailerCheck's single verification API endpoint, receives the result, and updates the contact's tag or custom field in ActiveCampaign based on the verification status. Invalid addresses can be automatically unsubscribed or moved to a separate list.

Common Use Cases

• Pre-campaign list cleaning: Before sending a major campaign or product launch email, run your target segment through MailerCheck to minimize bounces and protect deliverability.
• New subscriber verification: Automatically verify each new email address added to ActiveCampaign to catch typos, disposable addresses, and fake sign-ups before they enter your automation sequences.
• Re-engagement campaign preparation: Before sending to inactive subscribers, verify their addresses through MailerCheck. Many inactive contacts have abandoned their email addresses entirely.
• Import validation: When importing contacts from events, purchased lists, or third-party sources into ActiveCampaign, verify the entire batch through MailerCheck first to avoid polluting your list with bad addresses.
• Quarterly list audits: Schedule quarterly bulk verifications of your full ActiveCampaign database to identify addresses that have become invalid since the last check.

Tips and Best Practices

• Never delete contacts based solely on verification: Instead of deleting contacts that fail verification, tag them and exclude them from campaigns. The address may become valid again, or you may want to reach them through other channels.
• Verify before importing, not after: Whenever possible, run email lists through MailerCheck before importing them into ActiveCampaign. This prevents invalid addresses from ever entering your CRM and affecting your metrics.
• Handle "risky" addresses carefully: MailerCheck's "risky" category includes catch-all domains that accept all emails but may not deliver them. Test these with a small send before including them in major campaigns.
• Use ActiveCampaign's engagement scoring alongside verification: Combine MailerCheck verification data with ActiveCampaign's built-in engagement scoring to create a comprehensive contact quality score.
• Monitor your bounce rate trend: After implementing MailerCheck verification, track your ActiveCampaign bounce rate over time. You should see a significant decrease within the first few campaigns.
• Set up double opt-in: Complement MailerCheck verification with ActiveCampaign's double opt-in feature. Together, they create two layers of protection against invalid and unengaged contacts.