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

Access

Settings → Exclusions.

Two exclusion lists available: Excluded Contacts and Excluded Companies.

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 sequences.

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 lists and sequences.

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 lists.

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‑List Exclusion

Important: Topo automatically prevents duplicate outreach across lists, so you typically don’t need to manually exclude leads that are already part of another list.

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

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

• You don’t need to manually manage cross‑list exclusions in most cases. If you still want to contact leads across different sequences / 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.