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A suppression list is a CSV file you upload to Clodura AI containing contact data you already know about — email addresses, company websites, or contact names. Once uploaded, the list serves one of two purposes depending on how you apply it: you can use it to exclude those records from fresh search results so you never prospect into your existing customer base, or you can use it to enrich those records with verified emails, phone numbers, or company-level intelligence. Suppression lists save you from manually hunting through search results to remove records you already have, and they ensure every new search delivers truly net-new leads.

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The Two Purposes of Suppression Lists

Enrich existing leads

Upload a CSV of websites, emails, or contact names to automatically pull additional company data and contact details for records you already own. Turn a partial list into a fully enriched dataset without manual lookups.

Exclude from fresh searches

Enable the Suppress toggle on a suppression list filter to remove those contacts from your search results automatically. Any contact matching the uploaded list is filtered out, keeping your pipeline free of duplicates and existing customers.
You can upload up to 10,000 records per CSV suppression list (for email and website lists). Contact name lists also support up to 10,000 records. For smaller datasets, you can type entries directly into the text box (up to 1,000 entries without a CSV).

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Types of Suppression Lists

Clodura AI supports three suppression list types, each designed for a different kind of data:
TypeFile RequirementsTypical Use
Email SuppressionCSV of email addressesExclude or enrich by email identity
Website SuppressionCSV of domain/website URLsExclude or enrich by company domain
Contact Name SuppressionCSV with First Name, Last Name, Company Name (and optional Designation)Exclude or enrich by individual identity

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Email Suppression

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Creating an Email Suppression List

1

Open the filter panel

In the People Search or Company Search filter panel, locate the Suppressions section and click the Suppression List link above the Email IDs dropdown box. A pop-up window opens.
2

Choose New List or Existing List

  • New List: Select the New List radio option, enter a name for the list, and choose Email IDs as the suppression type.
  • Existing List: Select the Existing List radio option and pick a previously created email list from the dropdown.
3

Add your email addresses

You have two options:
  • Type or paste emails: Enter addresses directly in the text box, separated by commas. You can add up to 1,000 email addresses this way.
  • Upload a CSV: Choose the CSV suppression type, drag and drop your file, and click Upload. CSV uploads support up to 10,000 email addresses.
4

Review and filter

Click Next to preview the uploaded list. Enable the Hide Invalid Emails toggle to remove malformed addresses from view. Use the search box to verify specific addresses.
5

Save the list

  • Save and Select: Saves the list and immediately applies it as an active filter in your current search.
  • Save: Saves the list without applying it — you can select it from the dropdown later.

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Managing Email Suppression Lists

Open the Manage Email Lists tab within the Suppression List pop-up. From there you can:
  • Click the Email Icon next to a list to view or delete individual email addresses within it.
  • Click the Delete Icon to remove the entire list.
  • Select multiple lists and click Delete to bulk-remove them.
Once a list is saved, it appears in the Email IDs dropdown in the filter panel, ready to select for any future search.

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Website Suppression

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Creating a Website Suppression List

1

Open the filter panel

In the filter panel, click the Suppression List link above the Website dropdown box. A pop-up window opens.
2

Choose New List or Existing List

  • New List: Select New List, enter a name, and choose Website as the suppression type.
  • Existing List: Select Existing List and pick an existing website list from the dropdown.
3

Add your website URLs

  • Type or paste URLs: Enter domain URLs directly in the text box, separated by commas. Supports up to 1,000 websites.
  • Upload a CSV: Choose the CSV type, drag and drop your file, and click Upload. Supports up to 10,000 websites.
4

Review and filter

Click Next to preview the list. Toggle Hide Invalid Websites to remove malformed URLs. Use the search box to find specific domains.
5

Save the list

  • Save and Select: Saves and applies the list immediately.
  • Save: Saves for later use.

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Managing Website Suppression Lists

Open the Manage Website Lists tab in the pop-up to view, delete individual URLs, or remove entire lists. Saved website lists appear in the Website dropdown for selection in any future search.
Website suppression lists are particularly powerful for enrichment. Upload a CSV of company domains and Clodura AI will automatically retrieve additional company-level data — industry, size, financials, and more — for every matching domain.

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Contact Name Suppression

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Creating a Contact Name Suppression List

1

Navigate to the right module

Go to either the Contact module (Search Contact) or the Companies module (Search Companies) and locate the Suppressions section in the filter panel.
2

Open the suppression list panel

Click Suppression List next to the Contact Name suppression filter to open the management panel.
3

Create a new list

Select the New List radio option, enter a name for the list, and choose the suppression list to include.
4

Upload your CSV

Drag and drop a CSV file or browse to select one. Click Upload.Your CSV must include these mandatory columns:
  • First Name
  • Last Name
  • Company Name
  • Designation (optional)
The file can contain up to 10,000 records.
5

Review contacts

After uploading, a panel displays all contacts from the CSV. To remove a specific record, click the Remove button in the Action column on the far right. Use the Search Name box to locate a particular contact quickly.If you selected the wrong file, click Not This File? to return to the upload screen.
6

Save the list

  • Save & Select List: Saves the list and immediately adds it to the Contact Name Suppression filter.
  • Save List: Saves the contacts to the specified list without applying it yet.

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Adding to an Existing Contact Name List

Select the Existing List radio option in the panel, then drag and drop a new CSV file. The contacts from the new CSV are appended to the existing list without replacing its current records.

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Managing Contact Name Lists

Open the Manage Name List tab to:
  • Delete an entire list by checking the checkbox next to its name and clicking Delete.
  • Delete an individual contact by clicking Show Contacts, finding the record, and clicking Remove in the Action column.
Once saved, the name list appears in the Contact Name Suppression dropdown for selection in any search.

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Applying a Suppression List as a Filter

After creating a suppression list, you apply it during a search in one of two ways:
1

Select the list from the dropdown

In the Suppressions section of the filter panel, open the Email IDs, Website, or Contact Name dropdown and select the suppression list you want to use.
2

Toggle Suppress on or off

  • Suppress toggle ON: Contacts or companies matching the list are excluded from your search results. Use this to eliminate existing customers, opted-out contacts, or blacklisted domains from fresh prospecting.
  • Suppress toggle OFF: The list is applied for enrichment only — matching records receive additional data without being removed from your results.
3

Run your search

Click Search. The results reflect your suppression preference automatically.
Suppression lists with the Suppress toggle enabled permanently filter matching contacts out of your visible results for that search session. Double-check that you are applying the correct list before running a search across a large database query.