Mailchimp Email
Verification Integration
Mailchimp is one of the most popular email marketing platforms out there — but even the best platform cannot save you from bounces if your audience has bad emails lurking in it. Connect to ValidEmailChecker and verify your entire audience directly, with no exports, imports, or spreadsheet gymnastics.
Connect Mailchimp
Enter your API key to get started
Connection Name
Mailchimp API Key
Where to find: Profile → Extras → API Keys → Create A Key (include data center suffix e.g., -us21)
What You Need to Get Started
Mailchimp Account
Any plan — Free, Essentials, Standard, or Premium.
API Key
Profile → Extras → API Keys.
Verification Credits
1 credit per email verified.
60 Seconds
That is all it takes to connect.
How to Connect Mailchimp
The entire setup takes under a minute. Here is exactly what to do.
Create Your Mailchimp API Key
Log in to your Mailchimp account. Click your profile icon in the bottom-left corner and select Profile. Click Extras in the top navigation and select API keys. Scroll down and click Create A Key, give it a descriptive name (like "Valid Email Checker Integration"), and click Generate Key.
Your API key will look like:
Full API Key (with data center suffix)
a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6-us21
Critical: Copy the entire key including the part after the hyphen (like -us21). That suffix identifies your Mailchimp data center and is required for the connection to work. Mailchimp only shows the full key once — if you lose it, create a new one.
Connect Your Account
In ValidEmailChecker, go to Bulk Upload and click Connect Email Platform (or go to Integrations in the sidebar). Find and click Mailchimp. Enter a friendly connection name and paste the full API key including the data center suffix. Click Connect Account and we will verify your key and sync your audiences.
What we access: We only read your audiences and contact email addresses for verification. We optionally update contact statuses if you choose automatic cleaning. We never send emails, access your campaigns, or modify your automations.
Select an Audience and Configure
Once connected, you will see all your Mailchimp audiences with contact counts. Use the search bar to find specific audiences, then select the one you want to verify. Choose your mode: Verify Only to review results before making changes, or Clean Automatically to remove invalid and disposable emails directly from your Mailchimp audience. Toggle on Remove Duplicates to skip duplicate emails and save credits.
Delete is permanent:When you choose "Delete" for any email type, contacts are permanently removed from your Mailchimp audience. This cannot be undone. If you are unsure, use "Unsubscribe" instead — you can always delete later from within Mailchimp.
Track Results in Real Time
Click Import Listand you will be redirected to the Uploads & Results page where you can watch progress in real time. No need to refresh — the page updates automatically. When complete, click View Results to see the full breakdown. If you chose automatic cleaning, the changes are already applied to your Mailchimp audience.
Want a visual walkthrough with screenshots?
Our help center has the full step-by-step guide with images for every screen.
Two Ways to Verify
Verify Only
Import and verify your audience without modifying anything in Mailchimp. Review results, download reports, and decide what to do next — on your terms.
Best for:
Clean Automatically Recommended
Verify and clean in one step. Invalid emails are unsubscribed or deleted directly from your Mailchimp audience — no manual work required.
You control each email type:
Unsubscribe vs Delete in Mailchimp
Unsubscribe Safer
Contact stays in your audience but is marked as "Unsubscribed." They will not receive campaigns or automations but you keep their profile data.
Delete Permanent
Contact is permanently removed from your audience. Profile data is gone forever and this action cannot be undone.
Tracking Your Verification Progress
Once verification starts, you are automatically redirected to the Uploads & Results page where everything updates in real time — no refreshing needed.
What you will see for each task:
Task ID
Unique identifier for this verification
List Name
Your audience name with the Mailchimp icon
Upload Date
When verification started
Total Emails
Number of contacts being verified
Status
Processing, Completed, Failed, or Deleted
Progress
Real-time percentage with progress bar
Processing
Verification in progress
Completed
Click "View Results" to see breakdown
With Warning
Some emails could not be processed (credits refunded)
Failed
Something went wrong (rare)
Managing Your Mailchimp Connection
Connection Actions
Click the three-dot menu next to any connection on your Integrations page:
Sync Now
Refresh your audience list from Mailchimp. Use when you have added new audiences or imported new contacts.
Rename
Change the connection display name — helpful when managing multiple accounts.
Delete
Remove this connection. Does not affect your Mailchimp account, audiences, or contacts.
Multiple Accounts
Managing multiple Mailchimp accounts? Connect as many as you need.
Click Connect Email Platform → Mailchimp
You will see your existing connections listed
Click "+ Add Another Account"
Enter the API key for your additional Mailchimp account
Give it a unique name to tell them apart
Use clear names like "Agency — Client A" or "Personal Newsletter." Each account needs its own API key. Verifications are tracked separately.
Credits & Billing
1 Credit = 1 Email
Same rate as all other verification methods.
Unknown = Refunded
Credits returned instantly for unverifiable emails.
Duplicates = Free
Toggle on Remove Duplicates to save credits.
Balance Visible
Check credits in the top-right corner of your dashboard.
Credits Running Low?
If you do not have enough credits for your audience size, you can purchase more credits instantly or set up auto-refill so you never run out during a critical verification.
Team Member Access
Team members can connect their own Mailchimp accounts and run verifications using the shared team credit balance. The account owner can see credits used by each team member in the transaction history.
Mailchimp Tips
Understanding Mailchimp Audiences
Mailchimp calls contact lists "audiences." Here is what you need to know about how they work with ValidEmailChecker.
Archived & Contact Statuses
Not all contacts in your audience are included in verification. Here is how different contact statuses are handled.
API Key Best Practices
Keep your Mailchimp API key secure and organized with these guidelines.
Troubleshooting
"Invalid API Key" Error
Make sure you copied the full key including the data center suffix (e.g., -us21). Check for extra spaces before or after the key. Verify the key has not been deleted or disabled in Mailchimp. Try generating a new API key if the current one is not working.
"No Audiences Found"
Log in to Mailchimp and confirm you have at least one audience with contacts. Check that the API key has full account access. Click Sync Now to refresh the audience list. If the issue persists, try disconnecting and reconnecting.
Audience Not Showing Up
Your audience list may be cached. Go to Integrations in ValidEmailChecker, find your Mailchimp connection, and click Sync Now from the three-dot menu. Wait a moment, then try selecting audiences again.
Verification Stuck at 0%
This is usually a temporary connection issue. Wait a few minutes — it may start processing. Check if Mailchimp is experiencing any outages. Try disconnecting and reconnecting the integration. Contact support if the issue persists.
Changes Not Appearing in Mailchimp
If you used "Clean list automatically," changes may take 5–10 minutes to sync and appear in Mailchimp. Refresh your Mailchimp audience page. Check the verification results in ValidEmailChecker to confirm actions were taken. Make sure you did not select "Verify Only" by mistake.
Best Practices for Mailchimp List Hygiene
Before Your First Verification
Ongoing List Hygiene
Recommended Actions
Frequently Asked Questions
No. ValidEmailChecker uses Mailchimp's API to read and optionally modify contacts, but it does not affect your Mailchimp subscription or billing. However, if you unsubscribe contacts (instead of deleting them), they still count toward your Mailchimp audience limit.
Currently, ValidEmailChecker imports the entire audience. To verify just a segment, you would need to export that segment from Mailchimp and upload it via file upload instead. We are working on direct segment support for a future update.
No. ValidEmailChecker verifies the emails but does not add tags or modify contact fields. Actions only include unsubscribe or delete for the "Clean list automatically" option. Your existing segments and tags remain untouched.
Archived contacts in Mailchimp are not included in the verification. Only subscribed and unsubscribed (but not archived or deleted) contacts are imported. If you need to verify archived contacts, you would need to unarchive them first in Mailchimp.
Yes. Just add a new connection with your API key. Your verification history in ValidEmailChecker is preserved — only the connection link is removed. All past results and reports remain accessible.
Absolutely. We only access what is needed for verification — email addresses and contact status. We do not store your Mailchimp data permanently after verification. Your API key is encrypted and stored securely. We never send emails, access your campaigns, or modify your automations.
Yes. Each Mailchimp account needs its own API key. Connect as many as you need and give each a descriptive name (like "Agency — Client A" or "Personal Newsletter") so you can tell them apart.
If we cannot determine whether an email is valid or invalid — for example, if the mail server did not respond or timed out — the result is marked as "Unknown" and the credit is automatically returned to your account. You only pay for definitive results.
Ready to Clean Your Mailchimp Audiences?
Sign up, connect your Mailchimp account, and verify your first audience in under two minutes. 200 free credits included — no credit card required.
Get Started Free200 free credits · No credit card · Results in minutes