A self-hosted autoresponder runs on your own infrastructure and lets you build email sequences that fire when a subscriber joins a list or triggers an event. Unlike SaaS platforms (Mailchimp, ActiveCampaign, ConvertKit), you own the data, you own the code, and you avoid per-contact fees. But the tradeoff is real: you handle deployment, updates, deliverability, and pairing with an SMTP relay. This guide covers the 8 self-hosted platforms actually worth considering in 2026, with the automation depth, license, and SMTP integration model that matter for choosing correctly. Prices, features, and maintenance status verified July 2026.
Looking for the broader comparison instead? This guide focuses specifically on autoresponder and automation depth, visual workflow builders, conditional logic, event triggers, sequence design. If you want the wider view of self-hosted email marketing platforms including bulk newsletter senders, SaaS reselling apps, and enterprise-grade options, read our Best Self-Hosted Email Marketing Platforms 2026 guide. The two articles are complementary: this one for automation depth, the other for feature breadth.
Self-hosted autoresponder comparison at a glance (2026)
| Tool | Stack | License | Autoresponder depth | SMTP model | Cost |
|---|---|---|---|---|---|
| Mautic | PHP / Symfony | GPL v3 | Deep: visual workflows, conditional logic, lead scoring, event triggers | Any SMTP relay | Free |
| Sendy | PHP | Commercial | Basic: sequence triggered by subscription | Amazon SES only | $79 one-time |
| Listmonk | Go | AGPL v3 | Basic: transactional API, campaign sequences | Any SMTP relay | Free |
| Keila | Elixir | AGPL v3 | Basic: double opt-in, welcome sequences | Any SMTP relay | Free |
| Mailtrain | Node.js | GPL v3 | Medium: triggered campaigns, subscription events | Any SMTP relay | Free |
| phpList | PHP | AGPL v3 | Basic: date-based reminders, welcome sequences | Any SMTP relay | Free |
| Mailwizz | PHP / Yii | Commercial | Medium: autoresponders + multi-tenant campaigns | Any SMTP or bulk relay | ~$79-149 one-time |
| Broadcast | Docker (Elixir) | Commercial | Deep: conditional sequences, bring-your-own-ESP | Any SMTP relay or ESP | $250 one-time |
Every tool in this list requires pairing with an SMTP relay or MTA for actual delivery. None of them are complete mail transfer agents on their own (with the exception of Postal, which bundles the MTA and is covered separately below). For deliverability, pair your chosen platform with Amazon SES, Postmark, Mailgun, or SendGrid, or run your own MTA on a VPS with proper SPF/DKIM/DMARC setup.
Quick pick by use case
- You need deep automation (behavior triggers, conditional branching, lead scoring): Mautic (free) or Broadcast (commercial, $250).
- You already pay for Amazon SES and want the cheapest wrapper: Sendy ($79 one-time, SES-locked).
- You only send newsletters, no complex sequences, technical team: Listmonk (free, blazing fast, Go single binary).
- EU origin / GDPR / DPO-friendly story is priority: Keila (free, Elixir, German origin, AGPL).
- Your team already runs Node.js and prefers JavaScript: Mailtrain (free, GPL, less active but functional).
- Non-profit or educational institution on a budget with basic needs: phpList (free, mature, AGPL).
- General-purpose commercial app with mainstream community and multi-tenant SaaS resell: Mailwizz ($79-149 one-time).
- You want a Mailchimp-grade UX with conditional sequences and no source-code obligations: Broadcast ($250 one-time).
Mautic: the deepest open-source automation platform
Stack: PHP / Symfony. License: GPL v3. Maintained by: Mautic community under Acquia stewardship.
Mautic is the closest open-source equivalent to ActiveCampaign or HubSpot. It ships a visual workflow builder with conditional branching, event-based triggers (page visits, form submissions, custom API events), lead scoring, dynamic segmentation, contact tagging, and multi-channel campaigns (email + SMS + web push). Autoresponder depth here is genuinely on par with commercial marketing automation platforms.
Hardware requirements: 4-8 GB RAM minimum for a production install (much higher than Listmonk or phpList). PHP-FPM plus MySQL/MariaDB plus a queue worker.
Strengths: visual automation graph, native integrations with Salesforce and HubSpot, GPL license (does not trigger AGPL disclosure obligations for SaaS builders), large community.
Weaknesses: heavy resource footprint, PHP ecosystem, slower release cadence than commercial peers, occasional breaking changes between major versions.
Best for: teams with PHP ops capability that need genuine marketing automation (not just newsletters) and want to avoid the AGPL disclosure obligation.
Sendy: the cheapest SES wrapper, with a hard lock-in
Stack: PHP. License: Commercial ($79 one-time). Maintained by: single developer (Ben Chestnut).
Sendy is a PHP application that talks exclusively to Amazon SES for sending. That constraint is the entire value proposition: SES is the cheapest bulk transactional email option (roughly $0.10 per 1,000 emails), and Sendy adds a Mailchimp-style UI on top for a one-time $79 license fee. Autoresponder capability is basic: sequences triggered by subscription, no visual workflow builder, no conditional logic, no behavior triggers.
Hardware requirements: minimal. Runs on a shared LAMP host.
Strengths: extremely cheap to run at scale (SES bills only), easy setup, mature and stable code, big user base.
Weaknesses: SES-locked (cannot switch to Mailgun or Postmark), single-developer risk, no automation depth, no support tier beyond email.
Best for: teams already committed to AWS and SES, high-volume senders where per-email SMTP cost matters, users who need Mailchimp-style broadcasts without automation.
Listmonk: fastest and lightest, newsletter-focused
Stack: Go (single binary). License: AGPL v3. Maintained by: Kailash Nadh (Zerodha), active community.
Listmonk is a single Go binary backed by PostgreSQL. It handles subscriber management, list segmentation, campaign scheduling, bounce processing, and open/click analytics with an idle RAM footprint under 100 MB. Throughput at scale is genuinely impressive: hundreds of thousands of emails per hour when paired with a high-throughput SMTP relay. Autoresponder capability is basic (transactional API, scheduled campaigns), not a visual workflow builder.
Hardware requirements: 2 GB RAM is comfortable. PostgreSQL required (not MySQL).
Strengths: single binary deployment, exceptional performance, modern REST API, active maintenance, clean UI.
Weaknesses: AGPL license triggers source-disclosure obligations for SaaS resellers, no visual automation, PostgreSQL adds ops complexity vs Sendy’s MySQL.
Best for: technical teams sending newsletters at scale who want minimal ops overhead and do not need behavior-triggered automation.
Keila: EU-origin AGPL alternative on Elixir
Stack: Elixir / Phoenix. License: AGPL v3. Maintained by: Karl-Freitag Ballenweg (Germany).
Keila is a newer Elixir-based platform positioned as the EU-native answer to Mailchimp. It handles double opt-in, subscription forms, campaign scheduling, and basic welcome sequences. The Elixir runtime gives it favorable concurrency characteristics for sending. UI is modern and cleaner than most alternatives. Autoresponder capability is basic to medium: welcome sequences and scheduled campaigns rather than complex behavior trees.
Hardware requirements: 2-4 GB RAM. PostgreSQL required.
Strengths: German origin (strong GDPR story for EU compliance-conscious teams), modern UX, active development, AGPL for principled open-source.
Weaknesses: Elixir hosting is less common than PHP or Node (harder to find ops help), smaller community than Mautic or Listmonk, AGPL disclosure for SaaS resellers.
Best for: EU teams prioritizing data sovereignty and GDPR compliance as the primary decision axis.
Mailtrain: Node.js autoresponders for developer teams
Stack: Node.js. License: GPL v3. Maintained by: community, less active than 2020-2022 peak.
Mailtrain provides subscription management, list segmentation, and triggered campaigns with a Node.js runtime. Autoresponder capability is medium: triggered by subscription events, RSS feeds, or scheduled sends. Not a visual workflow builder like Mautic but more capable than Listmonk or phpList for sequences.
Hardware requirements: 2 GB RAM. MySQL or PostgreSQL, Redis for queues.
Strengths: GPL license (no AGPL disclosure for SaaS), Node.js stack fits JavaScript-centric teams, decent subscriber management.
Weaknesses: quality varies between major versions (v2 was a substantial rewrite), smaller and less active community than Mautic, less polished UI.
Best for: Node.js-first teams comfortable extending the codebase in JavaScript.
phpList: the veteran, still going
Stack: PHP. License: AGPL v3. Maintained by: phpList Ltd (UK non-profit).
phpList has existed since 2000 and remains actively maintained. It handles lists, campaigns, bounce processing, and basic scheduled autoresponders (date-based reminders, welcome sequences). The UI shows its age but the underlying reliability is proven. Especially popular with non-profits, universities, and community organizations.
Hardware requirements: minimal. Standard LAMP host.
Strengths: extremely mature and stable, low resource footprint, good documentation, non-profit friendly community.
Weaknesses: dated UI, basic automation capability, slower pace of feature development than Listmonk or Mautic.
Best for: non-profits, educational institutions, community groups sending newsletters where basic autoresponders are enough.
Mailwizz: mature commercial general-purpose platform
Stack: PHP / Yii. License: Commercial (Extended license ~$149 one-time on CodeCanyon).
Mailwizz is a long-running commercial self-hosted email marketing app with tens of thousands of sales, years of updates, and an active user community. It supports lists, campaigns, autoresponders (medium depth), multi-customer accounts (SaaS reselling), and pairs with any SMTP delivery server or bulk sender.
Hardware requirements: standard LAMP/Yii stack. 2-4 GB RAM comfortable.
Strengths: battle-tested over many years, large community and forum, official and third-party plugins, multi-tenant SaaS reselling.
Weaknesses: PHP/Yii-based expects proper LAMP stack ops, upgrades and performance tuning are on you, commercial license (one-time but not open source).
Best for: agencies wanting a proven multi-tenant SaaS platform they can resell without AGPL obligations.
Broadcast: Mailchimp-grade UX in a Docker box
Stack: Docker (Elixir). License: Commercial ($250 one-time).
Broadcast is a newer commercial self-hosted platform focused on polished UX and conditional sequences. Bring-your-own-ESP model: pair it with any SMTP relay or ESP (SES, Postmark, Mailgun, SendGrid). Autoresponder depth is deep: visual sequence builder with conditional logic, event triggers, and delay actions. Positions itself between the free open-source stack (Listmonk, Mautic) and the commercial SaaS platforms (Mailchimp, ConvertKit).
Hardware requirements: 2-4 GB RAM. Docker Compose deployment.
Strengths: genuinely polished UI, deep autoresponder capability, one-time license (not subscription), no AGPL disclosure obligations, active maintenance.
Weaknesses: commercial license (not open source), smaller community than Mautic, single-vendor risk if the company changes direction.
Best for: teams that want Mailchimp-grade UX and sequences on their own infrastructure without AGPL obligations, and are comfortable paying once for maintained software.
Bonus: Postal as MTA + marketing layer
Postal is a Ruby-based full MTA (mail transfer agent) that bundles subscriber management, click/open tracking, and basic campaign features. Unlike the tools above that need pairing with SES or Postmark, Postal is the SMTP relay itself. This makes it unique: run Postal on a VPS with proper SPF/DKIM/DMARC and you eliminate per-email relay costs entirely. Autoresponder capability is minimal, so most teams pair Postal (delivery layer) with Listmonk or Mautic (marketing layer).
Best for: high-volume senders where SMTP relay costs are prohibitive, teams comfortable managing their own IP reputation and deliverability.
License comparison: AGPL vs GPL vs Commercial
License matters most if you plan to build a SaaS on top of one of these tools and resell email marketing to your customers as a service.
| License | Tools | SaaS reselling implication |
|---|---|---|
| AGPL v3 | Listmonk, Keila, phpList | Network use triggers source-disclosure obligation. If you host it and let customers use it, you must make your modifications available. |
| GPL v3 | Mautic, Mailtrain | Network use does not trigger disclosure. Modifications you do not redistribute as binaries stay private. |
| Commercial | Sendy, Mailwizz, Broadcast | Per-license terms apply. Typically no source-disclosure obligation. Verify each vendor’s license terms for SaaS reselling. |
SMTP relay pairing: the deliverability layer you cannot skip
All self-hosted autoresponders (except Postal) need a delivery layer. Your options:
- Amazon SES ($0.10 per 1,000 emails), cheapest for bulk, IP warmup manual. Pairs with any tool; Sendy is SES-only by design.
- Postmark (~$15/mo for 10k emails), best deliverability reputation, transactional focus.
- Mailgun (pay-as-you-go, ~$0.80 per 1,000), developer-focused, flexible.
- SendGrid (tiered pricing), enterprise-friendly, higher deliverability for volume.
- Self-hosted MTA (Postal, Postfix + OpenDKIM + OpenDMARC) on a VPS with clean IP, zero per-email cost, full control, but you own the IP reputation and complaint handling. See our Hetzner VPS setup guide for the infrastructure side.
Regardless of which relay you pick, publish clean SPF, DKIM, and DMARC records on your sending domain. Self-hosting the marketing layer does not exempt you from the deliverability requirements every ESP shares.
Frequently Asked Questions
What is the best free self-hosted autoresponder in 2026?
Mautic if you need genuine automation depth (visual workflow builder, conditional logic, lead scoring). Listmonk if you only need newsletters at high performance with minimal ops overhead. Keila if you prioritize EU-origin AGPL compliance. All three are free of licensing cost; you pay for the VPS and the SMTP relay.
Is Sendy still worth the $79 in 2026?
Only if you are already committed to Amazon SES. Sendy’s entire value proposition is the SES-only wrapper: dirt-cheap delivery at scale plus a Mailchimp-style UI for a one-time license fee. If you want to keep the option to switch to Mailgun, Postmark, or SendGrid later, pick Listmonk (free) or Broadcast ($250 one-time) instead.
Do I need a dedicated IP for self-hosted email marketing?
Depends on volume and use case. If you are sending under 50,000 emails per month, a shared IP from your SMTP relay (SES, Postmark, Mailgun) is fine. Above 100,000 emails per month or if you send to sensitive segments, a dedicated IP starts to pay off (better isolation from other senders’ reputation). Self-hosting an MTA like Postal gives you the dedicated IP by definition; you own the whole reputation stack.
What are the AGPL disclosure obligations for SaaS builders?
AGPL v3 (used by Listmonk, Keila, phpList) triggers a source-disclosure obligation when you provide the software as a network service to users, not just when you distribute binaries. If you build a SaaS on top and let customers access it, you must make your modifications available. GPL v3 (Mautic, Mailtrain) does not have this network clause, so private SaaS modifications stay private. Commercial licenses (Sendy, Mailwizz, Broadcast) have per-vendor terms; verify each vendor’s SaaS resell policy.
Can I run a self-hosted autoresponder on shared hosting?
Only for the lightest tools: Sendy, phpList, and Mailwizz can run on a decent shared LAMP host. Listmonk and Keila prefer PostgreSQL and their own binary process, so a VPS is easier. Mautic requires 4-8 GB RAM and is not suitable for shared hosting. Broadcast requires Docker so needs a VPS with root access. See our Hetzner VPS guide for a cheap VPS setup that fits any of these tools.
About the Author
Alaa · LinkedIn
Email infrastructure specialist with 8+ years of hands-on experience in SMTP, deliverability, and email verification. I’ve configured and troubleshot mail systems across Postfix, Exchange, and cloud relays, managed IP reputation and warmup campaigns, and built verification pipelines processing millions of addresses. My work spans DNS authentication (SPF, DKIM, DMARC, BIMI), bounce handling, blocklist monitoring, and compliance frameworks including CAN-SPAM and GDPR. I write every article on SMTPedia to give email professionals, developers, and marketers the accurate, RFC-grounded reference they need.
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