listmonk
Self-hosted newsletter and mailing-list manager in a single binary.
Newsletter setup and sending for clients with large lists, at SMTP cost.
Real savings at scale. Deliverability (domain setup, reputation) is the skill clients pay for.
AGPL-3.0 (LICENSE is the GNU AGPL v3 text; README: 'licensed under the AGPL v3 license').
Yes, you may install/host it for a paying client and charge for it; AGPL-3.0's network clause requires offering the source of any modified version to its network users.
Active (pushed 2026-10-07). Single Go binary + PostgreSQL. It does not send mail by itself in any meaningful volume: you need your own SMTP provider (e.g. SES or similar), which is a separate paid service and where deliverability and anti-spam compliance (consent, unsubscribe) sit. Badge indicates backing by Zerodha Tech.
Businesses with lists above 10,000 contacts
Newsletter setup and sending for clients with large lists, at SMTP cost.
none found (listmonk.app lists third-party one-click hosts such as Railway, Elestio, PikaPods and states 'listmonk has no affiliation with these providers').
Mailchimp-type newsletter SaaS (common knowledge; neither the README nor listmonk.app names a competitor). Mailchimp pricing page today: Essentials shown as '$18.67/mo for 12 months' (promotional, USD view); in the CAD view Standard 'starts at C$28.72/month'. Regular non-promo Essentials price: not found.