Blocklists automatically exclude contacts or companies from all outbound campaigns. Two methods: direct exclusion in Topo, or via HubSpot integration.

Access

Settings → Blocklist. Two lists: Company Blocklists and Contact Blocklists. Also accessible via Settings → Exclusions → Excluded Contacts for contact-level exclusions.

Option 1 — Exclusion via HubSpot

Create a company list in HubSpot (static or dynamic) matching your exclusion criteria — e.g., "All companies with an open opportunity" or "Companies assigned to a rep with activity in the last 30 days." In Topo's HubSpot integration settings, select that list as an exclusion source. As soon as a company enters the list, it's automatically excluded from all Topo campaigns.

Benefits: automated, dynamic, no manual imports.

Greyed-out entries: Companies excluded via HubSpot integration will appear greyed out in Topo's blocklist interface and cannot be removed directly from Topo.

To modify HubSpot-synced exclusions: You must either change the HubSpot integration settings to select different exclusion lists, or update the source HubSpot list itself.

This UI distinction helps you identify which exclusions are managed through HubSpot versus those managed directly in Topo, preventing confusion when attempting to modify exclusion lists.

Option 2 — Direct Exclusion in Topo

Contact Blocklist

Required field: email address. Add manually or import a CSV with one column of email addresses. All contacts with those emails are excluded from campaigns.

Company Blocklist

Required field: company domain (e.g., "example.com"). Add manually or import a CSV with a "domain" column. All contacts from that company domain are excluded.

Verification

Search within Topo by email address (contacts) or company domain (companies) to confirm exclusion status.

Option 3 — Organization Context Exclusions

Exclude entire categories of companies by defining criteria in your organization settings.

Navigate to Organization Context → Target Audience → Add another option and specify company types to exclude (e.g., "exclude managed service providers" or "exclude consultancies").

Benefits: Systematic exclusion of company categories without maintaining domain lists; applies organization‑wide to all campaigns.

Best Practices

• Always exclude current customers, partners, and competitors.

• Proactively block company categories outside your ICP (e.g., service providers, consultancies, wrong size range) using Organization Context exclusions or direct blocklists to prevent incorrect targeting.

• Watch for multi-domain companies — blocking "carrefour.fr" won't block "carrefour.com". Add all relevant domains.

• Keep blocklists up to date as relationships and ICP evolve.

• Use separate lists for contacts vs companies for clarity.

Blocklist System Limitations & Import Constraints

CSV Import File Size Limits

Contact Blocklist CSV imports are limited to <1000 lines per file.

• If you have more than 999 email addresses to exclude, split your list into multiple CSV files.

• Each file can contain a maximum of 999 email addresses.

• Import each file separately through the Contact Blocklist interface.

Automatic Cross‑Campaign Exclusion

Important: Topo automatically prevents duplicate outreach across campaigns, so you typically don’t need to manually exclude leads that are already being contacted in another campaign.

• A lead can only be in one sequence at a time.

• When a lead is active in a campaign, they’re automatically excluded from all other campaigns.

• Leads only become eligible for new campaigns 90 days after their last message was sent.

• You don’t need to manually manage cross‑campaign exclusions in most cases. If you still want to contact leads across different campaigns / below before the 90 days minimum threshold, this is technically possible. Just ask your POC at Topo.

Strategic Implications for Exclusion Planning

• Prioritize Company Blocklists (domain‑based) over Contact Blocklists when possible.

• Company exclusions prevent both current AND future contacts from those domains.

• Use Contact Blocklists only for specific individuals at companies you still want to prospect.

• Consider the ongoing maintenance required if relying heavily on contact‑level exclusions.

FAQ

I added a company to the blocklist but it was still contacted. Why?

Check: does the contact's email domain exactly match what you blocklisted? Does the company use multiple domains? Was the blocklist entry correctly imported and active? If using a HubSpot dynamic list, was the company included in the list before the campaign launched?

How do I exclude a competitor?

Settings → Organization Exclusions → add the company domain directly. No need to contact support.

How do I stop all leads from a specific company already in sequences?

Click the lead → Stop Sequence → Lose → All contacts at this company. No need to contact support.

Will the same person be contacted in multiple campaigns at once?

No. Topo automatically prevents this. A lead can only be in one sequence at a time. When a lead is active in a campaign, they’re automatically excluded from all other campaigns and only become eligible again 90 days after the last message sent. You don’t need to manually manage cross‑campaign exclusions.