Campaign Monitor Email
Verification Integration
Connect your Campaign Monitor account to ValidEmailChecker and verify your subscriber lists without exporting a single file. Just paste your API key, select a list, and start cleaning — keeping your deliverability high and your bounce rates low.
Connect Campaign Monitor
Enter your API key to get started
Connection Name
Campaign Monitor API Key
Where to find: Account Settings → API & integrations → Generate API key
What You Need to Get Started
Campaign Monitor Account
Any active plan.
API Key
Found in Account Settings → API & integrations.
Verification Credits
1 credit per email verified.
60 Seconds
Paste your key and you are connected.
How to Connect Campaign Monitor
One API key, three clicks, and you are verifying.
Find Your API Key
Log into Campaign Monitor. Click your profile icon in the top right, then select Account settings. In the left sidebar, click API & integrations. You will see your API Client ID and API Key. If you do not have an API key yet, click Generate API key. Copy the API Key — not the Client ID.
Important: Copy the API Key, not the API Client ID. They are different fields. The API Key is the authentication token that grants access.
Connect Your Account
In ValidEmailChecker, go to Integrations and click + Connect Integration. Select Campaign Monitor, enter a friendly connection name, paste your API Key, and click Connect Account. We verify your key instantly and pull in your lists. If you manage multiple Campaign Monitor accounts, connect them all — just give each a unique name.
Select a List and Configure
Once connected, you will see all your Campaign Monitor lists with subscriber counts. Select the list you want to verify, then choose Verify Only to review results without changes, or Clean Automatically to remove invalid and disposable emails directly from Campaign Monitor. You control what happens to each email type — unsubscribe, delete, or keep.
Tip: Automatic cleaning cannot be undone. Start with "Verify Only" on your first run to review results.
Track Results in Real Time
Click Start Verification and you will be redirected to the Uploads & Results page. Progress updates automatically — no refreshing needed. When complete, you get a full breakdown of safe, invalid, risky, disposable, catch-all, and more. If you chose automatic cleaning, changes are already applied to your Campaign Monitor list.
Want a visual walkthrough with screenshots?
Our help center has the full guide with images for every screen.
Two Ways to Verify
Verify Only
Import and verify without modifying anything in Campaign Monitor. Review results and decide what to do next.
Best for:
Clean Automatically Recommended
Verify and clean in one step. Invalid emails get unsubscribed or deleted directly from Campaign Monitor.
Actions available:
Tracking Your Verification Progress
Everything updates in real time on the Uploads & Results page.
Processing
Verification in progress
Completed
Click "View Results" for breakdown
With Warning
Some emails could not be processed
Failed
Something went wrong (rare)
Managing Your Campaign Monitor Connection
Connection Actions
Click the three-dot menu next to any connection:
Sync Now
Refresh lists and subscriber counts.
Rename
Change the connection display name.
Delete
Remove connection. Does not affect Campaign Monitor.
Updating your API key? If you regenerate your key in Campaign Monitor, delete the existing connection in ValidEmailChecker and create a new one with the new key.
Multiple Accounts
Managing campaigns for different clients or brands? Connect as many accounts as you need.
Go to Bulk Upload → Connect Email Platform → Campaign Monitor
Click "+ Add Another Account" in the connection picker
Enter the API key for the new account
Give it a unique name to tell them apart
Credits & Billing
1 Credit = 1 Email
Same rate as all other methods.
Unknown = Refunded
Credits returned for unverifiable emails.
Duplicates = Free
Removed before charging.
Balance Visible
Always in the top-right of your dashboard.
Campaign Monitor Tips
Unsubscribe vs Delete
List Segments
The integration imports your main Campaign Monitor lists. Segments are included in the main list import. For segment-specific verification, export that segment as CSV and use bulk upload.
Transactional vs Marketing
Both transactional and marketing lists appear in the list selector. Make sure you select the correct list type for verification to avoid cleaning the wrong list.
Troubleshooting
"Invalid API Key" Error
Make sure you copied the full API Key — not the API Client ID. Check for extra spaces before or after the key. Verify your Campaign Monitor account is active. If needed, generate a new API key in Campaign Monitor.
Lists Not Showing
Click Sync Now to refresh. Make sure your lists have at least one subscriber and that you are using an API key from the correct Campaign Monitor account.
Subscribers Not Updating After Cleaning
Campaign Monitor updates can take a few moments. Wait 2–3 minutes, refresh your Campaign Monitor list, and check the verification results page for any errors.
Best Practices
Before Your First Run
Ongoing Hygiene
Recommended Actions
Frequently Asked Questions
No. Connecting and syncing your Campaign Monitor account is completely free. You only use credits when you actually verify emails — 1 credit per email, same as every other verification method.
Yes. Connect as many accounts as you need — one for each client, brand, or campaign. Each gets its own named connection so you can tell them apart in the dashboard.
Never. We only read your subscriber emails for verification and optionally remove invalid ones if you choose automatic cleaning. We never send emails to your list, access your campaigns, or modify your account settings.
We import subscriber emails temporarily for verification. After 15 days, verification results are automatically deleted from our system. We never store your subscriber data permanently and never share it with third parties.
No. Once emails are unsubscribed or deleted from Campaign Monitor through automatic cleaning, the action cannot be reversed through ValidEmailChecker. You would need to restore them manually. Start with "Verify Only" first if you are unsure.
The API Client ID is an identifier for your account. The API Key is the authentication token that grants access. You need to paste the API Key — not the Client ID — into ValidEmailChecker. The key is found in Account Settings → API & integrations.
Currently, you verify one list at a time. This gives you more control over the process and lets you apply different cleaning rules to different lists. You can verify multiple lists back-to-back without reconnecting.
Ready to Clean Your Campaign Monitor Lists?
Sign up, paste your API key, and verify your first list in under two minutes. 200 free credits included — no credit card required.
Get Started Free200 free credits · No credit card · Results in minutes