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Campaign Monitor Integration

Connect your Campaign Monitor account to Valid Email Checker and verify your subscriber lists without exporting a single file. Just paste your API key and start cleaning.

What You Can Do​

Once connected, you can:

  • Import lists directly from Campaign Monitor for verification
  • See subscriber counts before importing
  • Clean lists automatically by removing or unsubscribing bad emails
  • Connect multiple Campaign Monitor accounts if you manage several

Before You Start​

Make sure you have:

  • An active Campaign Monitor account
  • At least one list with subscribers
  • Valid Email Checker credits for verification

Finding Your Campaign Monitor API Key​

Before connecting, you'll need to grab your API key from Campaign Monitor. Here's how:

Step 1: Access Account Settings​

  1. Log into your Campaign Monitor account
  2. Click your profile icon in the top right corner
  3. Select Account settings from the dropdown menu

Step 2: Navigate to API & Integrations​

In the left sidebar, click API & integrations.

Campaign Monitor Account Settings showing API & integrations section

Step 3: Get Your API Key​

You'll see two fields:

  • API Client ID — A long string identifier
  • API Key — Click Generate API key if you don't have one yet

Copy the API Key (not the Client ID). You'll paste this into Valid Email Checker in the next step.

Keep It Safe

Your API key gives access to your Campaign Monitor account. Don't share it publicly or commit it to code repositories.

Connecting Campaign Monitor​

Now let's connect your account to Valid Email Checker.

Step 1: Start the Connection​

  1. Go to Integrations in your sidebar
  2. Click + Connect Integration
  3. Find Campaign Monitor in the list and click it

You'll see the connection setup screen:

Campaign Monitor connection modal with API key field

Step 2: Enter Your Details​

Fill in the fields:

  • Connection Name (optional) — Give this connection a friendly name like "Main Newsletter Account" or "Client - ABC Company". Helpful if you'll connect multiple Campaign Monitor accounts.
  • Campaign Monitor API Key — Paste the API key you copied from Campaign Monitor.

Step 3: Connect​

Click Connect Account. Valid Email Checker will verify your API key and pull in your lists.

If successful, your Campaign Monitor account is now connected and ready to use.

Verifying a Campaign Monitor List​

Now for the fun part—let's verify some emails.

Step 1: Select Your Connection​

Go to Bulk Upload and click Connect Email Platform. You'll see your connected Campaign Monitor accounts:

Campaign Monitor connection picker showing connected accounts

The connection picker displays all your connected Campaign Monitor accounts. Click Sync Now on the account you want to use, or click + Add Another Account to connect additional Campaign Monitor accounts.

Step 2: Choose a List​

After syncing, you'll see all your Campaign Monitor lists with subscriber counts:

Campaign Monitor list selector with subscriber counts and verification options

Select the list you want to verify. The number in parentheses shows how many subscribers are in that list.

Large Lists

Have a big list? No problem. Valid Email Checker handles lists of any size. Just make sure you have enough credits—each email costs 1 credit to verify.

Step 3: Choose What Happens After Verification​

This is where you decide how hands-on you want to be. You have two options:

Option A: Verify Only​

Select Verify only to import and verify emails without making any changes to your Campaign Monitor list.

  • Emails are imported and verified
  • Your Campaign Monitor list stays exactly as it is
  • You review results and decide what to do
  • Best for: First-time users, cautious cleaners, compliance requirements

Option B: Clean List Automatically​

Select Clean list automatically to have bad emails removed from your Campaign Monitor list after verification.

When you choose this option, you can customize exactly what happens to each email type:

Email TypeAvailable ActionsDefault
InvalidUnsubscribe, Delete, KeepUnsubscribe
DisposableUnsubscribe, Delete, KeepDelete
Catch-allUnsubscribe, Delete, KeepKeep
UnknownUnsubscribe, Delete, KeepKeep
RiskyUnsubscribe, Delete, KeepKeep

Understanding the Actions:

  • Unsubscribe — Marks the subscriber as unsubscribed in Campaign Monitor. They remain in your list but won't receive emails. Good for compliance and record-keeping.
  • Delete — Permanently removes the subscriber from your Campaign Monitor list. They're gone completely.
  • Keep — Does nothing. The subscriber stays active in your list.
Choose Carefully

Automatic cleaning can't be undone. If you're not sure, start with Verify only and clean manually after reviewing the results.

Step 4: Start Verification​

Click the verify button to begin. You'll be taken to the Uploads & Results page where you can watch the progress:

Uploads & Results page showing Campaign Monitor verification in progress

The integration icon next to your list name indicates this verification came from Campaign Monitor.

What you'll see:

ColumnDescription
Task IDUnique identifier for this verification (e.g., VECKROMWMKU)
List NameThe name of your Campaign Monitor list
Upload DateWhen you started the verification
Total EmailsNumber of contacts being verified
StatusCurrent state (Processing, Completed, etc.)
ProgressPercentage complete with progress bar
ActionsView Results, Delete
Real-Time Updates

The page updates automatically—no need to refresh. You'll see the percentage progress increase as verification continues.

Status meanings:

  • 🔄 Processing — Verification in progress
  • ✅ Completed — All done! Click "View Results" to see the breakdown
  • ⚠️ Completed with Warning — Finished, but some emails couldn't be processed (credits refunded)
  • ❌ Failed — Something went wrong (rare)
  • 🗑️ Deleted — Results removed after 15-day retention period

Once verification completes, click View Results to see the breakdown.

Managing Your Campaign Monitor Connection​

Viewing Connected Accounts​

Go to Integrations to see all your connected Campaign Monitor accounts:

Integrations page showing connected Campaign Monitor account with management options

Each connection shows:

  • Provider — Campaign Monitor logo and name
  • Connection Name — The name you gave it (or default)
  • Status — Active
  • Connected — When you connected it

Available Actions​

Click the three-dot menu on any connection to access:

ActionWhat It Does
Sync NowRefreshes your Campaign Monitor lists and subscriber counts
RenameChanges the connection's display name
DeleteRemoves the connection entirely

When to Sync​

Hit Sync Now when:

  • You've added new lists in Campaign Monitor
  • Subscriber counts seem outdated
  • You've made significant changes to your lists

Syncing is fast and doesn't use any credits.

Updating Your API Key​

If you regenerate your API key in Campaign Monitor:

  1. Delete the existing connection in Valid Email Checker
  2. Create a new connection with the new API key

Deleting a Connection​

If you no longer need a Campaign Monitor connection:

  1. Go to Integrations
  2. Find the connection you want to remove
  3. Click the three-dot menu
  4. Select Delete
  5. Confirm the deletion
What Deletion Does

Deleting a connection only removes it from Valid Email Checker. Your Campaign Monitor account and all your subscribers remain untouched. You can always reconnect later.

Connecting Multiple Campaign Monitor Accounts​

Managing campaigns for different clients or brands? You can connect as many Campaign Monitor accounts as you need.

Adding Another Account​

  1. Go to Bulk Upload → Connect Email Platform
  2. Select Campaign Monitor
  3. In the connection picker, click + Add Another Account
  4. Enter the API key for the new account
  5. Give it a descriptive name to tell them apart

Each account shows separately in your connection picker, making it easy to switch between them.

Switching Between Accounts​

When you have multiple accounts connected:

  1. Click on Campaign Monitor from the Bulk Upload page or Integrations page
  2. The connection picker displays all your connected accounts
  3. Click Sync Now on the account you want to use
  4. Select your list and verify as usual

Campaign Monitor-Specific Tips​

Unsubscribe vs Delete​

Campaign Monitor gives you both options. Here's when to use each:

Use Unsubscribe when:

  • You need to maintain records for compliance
  • You want to prevent the email from being re-added
  • You're cleaning role-based emails you might want to review later

Use Delete when:

  • The email is clearly invalid or fake
  • You want a completely clean list
  • You're removing disposable emails

List Segments​

Currently, the integration imports your main Campaign Monitor lists. If you use segments within Campaign Monitor, they'll be included in the main list import. For segment-specific verification, consider exporting that segment as a CSV and using bulk file upload instead.

Transactional vs Marketing Lists​

If you have both transactional and marketing lists in Campaign Monitor, they'll all appear in the list selector. Make sure you select the correct list type for verification.

Troubleshooting​

"Invalid API Key" Error​

If your API key isn't accepted:

  • 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
  • Try generating a new API key in Campaign Monitor

Lists Not Showing​

If your Campaign Monitor lists don't appear after connecting:

  1. Click Sync Now to refresh
  2. Make sure the lists have at least one subscriber
  3. Verify you're using an API key from the correct Campaign Monitor account

Subscribers Not Updating After Cleaning​

Campaign Monitor updates can take a few moments to process. If subscribers aren't showing as unsubscribed or deleted:

  1. Wait 2-3 minutes
  2. Refresh your Campaign Monitor list
  3. Check the verification results for any errors

Frequently Asked Questions​

Does connecting Campaign Monitor cost credits?​

No. Connecting and syncing your Campaign Monitor account is free. You only use credits when you actually verify emails.

Can I connect multiple Campaign Monitor accounts?​

Yes! Connect as many accounts as you need. Each gets its own connection with a separate name.

Will you send emails to my subscribers?​

Never. We only read your subscriber emails for verification and optionally remove bad ones. We never send any emails to your list.

What happens to my Campaign Monitor data?​

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.

Can I undo automatic cleaning?​

No. Once emails are unsubscribed or deleted from Campaign Monitor, the action can't be reversed through Valid Email Checker. Always start with Verify only if you're unsure.

What's the difference between API Client ID and API Key?​

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 Valid Email Checker.

Can I verify all my lists at once?​

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.

Next Steps​

Need Help?​

Running into issues with your Campaign Monitor integration? We're here to help: