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Lemlist

When to use this guide: Read this before configuring Lemlist with OutboundSync to confirm what the integration covers today.

OutboundSync supports Lemlist as an engagement-platform source for email and LinkedIn campaign activity. Lemlist events are received by OutboundSync and written into HubSpot or Salesforce as activity on the matching contact or lead record.

What this integration does

Section titled “What this integration does”

Lemlist is an omnichannel sales engagement platform for email and LinkedIn outreach. OutboundSync maps Lemlist activity into CRM timelines so reps and RevOps can see campaign activity without relying on exports or manual logging.

Lemlist can also be used in partner-routed workflows through Master Inbox. When Lemlist is connected that way, use the Masterinbox docs and onboarding path for the current setup steps.

What syncs into your CRM

Section titled “What syncs into your CRM”
  • Email sends, opens, clicks, replies, bounces, and unsubscribes
  • Reply/category updates when provided by Lemlist
  • LinkedIn connection requests, messages, replies, and category updates
  • Campaign, lead, account, and timestamp metadata when available

Where it syncs

Section titled “Where it syncs”
  • HubSpot — direct integration or partner-routed setup, depending on account configuration
  • Salesforce — direct integration or partner-routed setup, depending on account configuration
  • Close — direct integration during the current Close beta
  • Attio — supported via Master Inbox during the current Attio beta

Category-based filters

Section titled “Category-based filters”

Optionally hold Lemlist email and LinkedIn activity until a lead is marked with an allowlisted category, then release the held history into your CRM. For the shared hold-and-release lifecycle, see How category-based filters work.

Lemlist exposes exactly two categories for this filter: Interested and Not Interested. Unlike Smartlead or EmailBison, filtered sync does not require a Lemlist API key — OutboundSync populates those two options statically in the webhook builder.

Enable in OutboundSync

Section titled “Enable in OutboundSync”
  1. Open the Lemlist webhook in OutboundSync and edit its settings.
  2. Under Approved events for data sync, choose the filtered option (FILTERED data syncs to your CRM).
  3. Under Category-based filter, select Interested and/or Not Interested.

When a lead hits an allowlisted category, OutboundSync releases held activity for that webhook, campaign, and lead. If the lead later leaves every allowlisted category, new activity is held again until they match the filter.

Events that unlock sync

Section titled “Events that unlock sync”

These Lemlist interest events map to Lead Category Updated in OutboundSync:

  • Email Interested
  • Email Not Interested
  • LinkedIn Interested
  • LinkedIn Not Interested

Include these interest events when the Lemlist webhook is configured — both Interested and Not Interested — so category state stays accurate even if you only allowlist Interested (the OutboundSync team can do this during guided setup). Test with a category event first — see Sending test webhook payloads.

This section applies to direct Lemlist webhooks. If Lemlist activity reaches OutboundSync through Master Inbox, confirm filtered-sync behavior during onboarding.

Scope and current limitations

Section titled “Scope and current limitations”
  • One-way sync. Data flows Lemlist -> CRM. Updates in the CRM are not written back to Lemlist.
  • Email + LinkedIn. Phone activity is out of scope for the current Lemlist docs.
  • Guided setup. Setup is currently handled with the OutboundSync team during onboarding.
  • Partner-routed setups differ. If your Lemlist activity reaches OutboundSync through Master Inbox, event availability and setup steps are confirmed during onboarding.

Get help and next steps

Section titled “Get help and next steps”