HubSpot
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HubSpot's inbound marketing suite integrates email with sales and customer service, creating a single platform for your entire customer lifecycle. The free-tier CRM is generous enough to start without commitment, and automation workflows connect email to lead scoring and sales handoff.
It's ideal for small teams that want marketing and sales in one place rather than maintaining separate tools. The unified data model means your email performs better when tied to real sales outcomes and customer history.