Best Open-Source CRM for Small Businesses with Email Integration

A fully-featured fork of SugarCRM offering lead management, workflow automation, and built‑in email sync with IMAP/SMTP for two‑way communication.

Lightweight CRM with customizable entities and native email integration that supports sending/receiving via Gmail, Outlook, and other IMAP accounts.

Modular ERP/CRM suite; the CRM app includes email integration through the built‑in mail gateway, allowing automatic logging of inbound/outbound messages.

Enterprise‑grade CRM with a visual workflow builder and email integration that captures messages from multiple mailboxes directly into contacts.

Comprehensive CRM with sales, support, and marketing modules; includes email sync, templates, and bulk mail campaigns.

All‑in‑one ERP/CRM solution; email integration via the built‑in mail collector and ability to send newsletters from the CRM.

Non‑profit focused CRM that also serves small businesses; provides email outreach, mailings, and inbound email tracking tied to contacts.

Open‑source sales automation platform with a robust email integration engine that logs all communications and supports templates.

Gamified CRM with built‑in email sync, allowing users to send and receive messages directly from the contact record.

Open‑source ERP that includes a CRM module; email integration via the Email Account feature, automatically linking emails to leads and opportunities.

Part of the Crust Platform; offers email integration, activity streams, and customizable pipelines for SMBs.

Ruby on Rails‑based lightweight CRM; supports email integration through Action Mailer and can log inbound/outbound messages.

Feature‑rich CRM built on Symfony; includes email integration via the Email Bundle for two‑way sync.

Java‑based CRM with extensive email integration, supporting IMAP/SMTP and automatic activity logging.

Standalone CRM mode of Dolibarr focusing on contact management and email campaigns, with built‑in mail collector.