License & Deployment Mix: 17 tools – 6 OSS, 8 SaaS. (OSS and SaaS counts can overlap when an open-source tool also offers a vendor-hosted edition.)
What Is Bulk Email?
Bulk email refers to sending email at scale – hundreds to millions of messages – for marketing campaigns, newsletters, transactional notifications, or automated sequences. Unlike an email server platform (Mailcow, Stalwart) that hosts individual mailboxes for sending and receiving, a bulk email platform specializes in high-volume outbound delivery with list management, campaign analytics, and deliverability optimization.
This directory evaluates complete bulk email platforms. For mailbox hosting platforms (IMAP/POP3/SMTP), see the Email Server Platforms directory.
Three Types of Email
Email programs typically distinguish three types of email, each with different infrastructure and requirements:
| Type | Purpose | Infra |
|---|---|---|
| System | Password resets, alerts | Postfix |
| Bulk | Newsletters, campaigns | This dir |
| Mailbox | User mailboxes | email-server/ |
System email consists of low-volume, triggered messages (password changes, monitoring alerts, report delivery) sent directly from an application, usually via a dedicated MTA such as Postfix. It is out of scope for this directory.
Bulk email is the focus of this directory – high-volume outbound delivery requiring list management, deliverability optimization, and compliance handling.
A bulk email platform typically provides:
- Campaign builder – visual editor for marketing emails with templates and personalization
- List management – subscriber lists, segments, tags, opt-in/opt-out handling
- Transactional email – triggered messages (order confirmations, password resets, notifications)
- Automation – drip campaigns, welcome sequences, event-triggered workflows
- Analytics – open rates, click rates, bounces, unsubscribes, revenue attribution
- Deliverability tools – IP warm-up, reputation monitoring, authentication management
- SMTP relay – API or SMTP endpoint for application-generated email
- Compliance – CAN-SPAM, GDPR, unsubscribe handling, consent management
The information on these pages was researched by a combination of human review and large language models. To suggest an addition or correction, please contact us. Prepared by Rhodium Systems Inc., author of the ResorsIT platform — a unified IT operations management platform for IT teams and MSPs that integrates a curated suite of open-source, commercial, and SaaS applications into a single system with shared identity, single sign-on, access control, and a common audit trail. Use this catalogue only as a starting point for your own research, and review any tool carefully against your own requirements before relying on it. Catalogue data version 2026.197.
Comparison
Key distinction: bulk email platforms handle high-volume outbound delivery, not mailbox hosting. For mailbox platforms (IMAP/POP3/SMTP), see Email Server Platforms.
SSO/OIDC Support
SSO applies to the admin panel (campaign management, list management, analytics).
| Tool | Admin OIDC | Admin SAML | Admin LDAP | Notes |
|---|---|---|---|---|
| Mautic | Plugin | SAML* | LDAP* | SAML via plugin |
| Listmonk | Yes* | No | No | Native OIDC (v6.0+) |
| Postal | No | No | No | Basic auth only |
| Mailtrain | No | No | No | Local auth only |
| phpList | No | No | No | Local auth only |
| Keila | No | No | No | Local auth only |
| MailWizz | No | No | No | Local auth only |
| Sendy | No | No | No | Local auth only |
| Mailchimp | No | SAML* | No | Standard plan+ |
| Brevo | No | SAML* | No | Enterprise plan |
| SendGrid | No | SAML* | No | Pro plan+ |
| Amazon SES | IAM* | IAM* | No | AWS IAM/SSO |
| Mailgun | No | SAML* | No | Scale plan+ |
| Postmark | No | No | No | No SSO |
| Constant Contact | No | No | No | No SSO |
| ActiveCampaign | No | SAML* | No | Enterprise plan |
* = requires paid plan, plugin, or external configuration Proxy = via reverse proxy header authentication IAM = AWS Identity and Access Management / AWS SSO
Best admin SSO: Listmonk (native OIDC since v6.0, January 2026 – direct Authentik integration), Mautic (SAML plugin + LDAP), Amazon SES (via AWS SSO/IAM Identity Center)
No SSO: Most self-hosted tools lack native SSO; reverse proxy authentication is the workaround for Authentik integration.
API Comparison
| Tool | API Type | Auth | Rate Limits | SDKs |
|---|---|---|---|---|
| Mautic | REST | OAuth2 / Basic | No built-in | PHP |
| Listmonk | REST | Basic / Token | No built-in | None (simple REST) |
| Postal | REST | API key | No built-in | Ruby, Node.js |
| Mailtrain | REST | Access token | No built-in | None |
| phpList | REST | API key | No built-in | PHP |
| Keila | REST | API key | No built-in | None |
| MailWizz | REST | API key | Configurable | PHP |
| Sendy | REST | API key | No built-in | PHP |
| Mailchimp | REST v3 | OAuth2 / API key | 10 req/s | 7+ languages |
| Brevo | REST v3 | API key | Varies by plan | 7+ languages |
| SendGrid | REST v3 | API key (Bearer) | Varies by plan | 7+ languages |
| Amazon SES | REST v2 | AWS Sig v4 | 1-200/s* | All AWS SDKs |
| Mailgun | REST | API key (Basic) | Varies by plan | 7+ languages |
| Postmark | REST | Server token | 50 req/10s | 9+ languages |
| Constant Contact | REST v3 | OAuth2 | 10,000/day | PHP, Ruby |
| ActiveCampaign | REST v3 | API key | 5 req/s | PHP, Python, Node.js, Ruby |
* = Amazon SES sending rate depends on account reputation; starts at 1/s, increases to 200+/s
Best API ecosystem: SendGrid (most SDKs, best docs), Mailchimp (largest integration ecosystem), Amazon SES (all AWS SDKs)
Best self-hosted API: Mautic (OAuth2, full CRUD), Listmonk (simple, well-documented REST)
Email Capabilities
| Tool | Marketing | Transactional | Automation | A/B Test | Templates |
|---|---|---|---|---|---|
| Mautic | Yes | Yes | Advanced | Yes | Visual + code |
| Listmonk | Yes | Yes | Basic | No | Go templates |
| Postal | No | Yes | No | No | None (API) |
| Mailtrain | Yes | No | Basic | No | MJML + HTML |
| phpList | Yes | No | Basic | No | HTML |
| Keila | Yes | No | No | No | WYSIWYG + MD |
| MailWizz | Yes | Yes* | Advanced | Yes | Visual + code |
| Sendy | Yes | No | Basic | Yes | HTML |
| Mailchimp | Yes | Yes* | Advanced | Yes | Visual + code |
| Brevo | Yes | Yes | Advanced | Yes | Visual + code |
| SendGrid | Yes | Yes | Advanced | Yes | Dynamic (HBS) |
| Amazon SES | No* | Yes | No | No | SES templates |
| Mailgun | No* | Yes | No | No | MIME/HTML |
| Postmark | Broadcast | Yes | No | No | Mustachio |
| Constant Contact | Yes | No | Yes | Yes | Visual + code |
| ActiveCampaign | Yes | Yes* | Advanced | Yes | Visual + code |
Yes* = available via add-on or separate service No* = infrastructure only; pair with frontend tool Broadcast = limited marketing (non-promotional only) HBS = Handlebars templating MD = Markdown
Best marketing automation: Mautic (open source), ActiveCampaign (SaaS), Mailchimp (SaaS)
Best transactional: Postmark (deliverability), SendGrid (ecosystem), Amazon SES (cost)
Deliverability Features
| Tool | Dedicated IP | DKIM Mgmt | SPF Mgmt | Bounce Handling | Reputation Monitor |
|---|---|---|---|---|---|
| Mautic | Self-managed | Manual | Manual | Plugin | No |
| Listmonk | Self-managed | Manual | Manual | Bounce webhook | No |
| Postal | Self-managed | Built-in | Manual | Automatic | Built-in |
| Mailtrain | Via SMTP srv | Via SMTP srv | Manual | Via SMTP srv | No |
| phpList | Self-managed | Manual | Manual | Built-in | No |
| Keila | Via SMTP srv | Via SMTP srv | Manual | Via sender | No |
| MailWizz | Via delivery srv | Via delivery srv | Manual | Automatic | No |
| Sendy | Via SES | SES managed | Manual | SES SNS | No |
| Mailchimp | $29.95/mo | Automatic | Guide | Automatic | Included |
| Brevo | Enterprise | Automatic | Guide | Automatic | Included |
| SendGrid | $90+/mo | Automatic | Guide | Automatic | Included |
| Amazon SES | $24.95/mo | Built-in | Guide | SNS notify | VDM* |
| Mailgun | $35+/mo | Automatic | Guide | Automatic | Included |
| Postmark | Shared only | Automatic | Guide | Automatic | Included |
| Constant Contact | Shared only | Automatic | Guide | Automatic | Included |
| ActiveCampaign | Enterprise | Automatic | Guide | Automatic | Included |
Self-managed = you manage your own sending IPs Via SMTP srv = depends on configured SMTP/delivery service Via delivery srv = depends on configured delivery server (SES, SendGrid, etc.) VDM = Virtual Deliverability Manager (paid add-on)
Best self-hosted deliverability: Postal (built-in DKIM, bounce handling, IP pool management)
Best SaaS deliverability: Postmark (99%+ inbox rate, strict anti-spam policy), SendGrid (dedicated IPs, reputation dashboard)
Compliance & List Management
| Tool | Double Opt-In | 1-Click Unsub | GDPR Tools | Segments | Suppression |
|---|---|---|---|---|---|
| Mautic | Yes | Yes | Consent mgmt | Advanced | Yes |
| Listmonk | Yes | Yes | Manual | Tags + SQL | Yes |
| Postal | N/A* | N/A* | N/A* | N/A* | Suppression |
| Mailtrain | Yes | Yes | Manual | Custom fields | Yes |
| phpList | Yes | Yes | Plugin | Attributes | Yes |
| Keila | Yes | Yes | Built-in | Tags | Yes |
| MailWizz | Yes | Yes | Manual | Advanced | Yes |
| Sendy | Yes | Yes | Manual | Segments | Yes |
| Mailchimp | Yes | Yes | GDPR fields | Advanced | Yes |
| Brevo | Yes | Yes | Built-in | Advanced | Yes |
| SendGrid | API | Yes | Manual | API-based | Yes |
| Amazon SES | API | API | Manual | None* | Yes |
| Mailgun | API | Yes | Manual | Tags | Yes |
| Postmark | N/A* | Yes | Manual | Streams | Yes |
| Constant Contact | Yes | Yes | Built-in | Tags | Yes |
| ActiveCampaign | Yes | Yes | Built-in | Advanced | Yes |
N/A* = Postal/Postmark/SES are infrastructure-level; list management is handled by the calling application API = must implement via API; not built into a UI None* = SES has no list management; use with Sendy or custom application
Best compliance: Mautic (full GDPR consent management), Brevo (GDPR built-in, EU company), ActiveCampaign (comprehensive compliance tools)
Best segmentation: Mautic (contact-level behavioral), ActiveCampaign (behavioral + predictive), Mailchimp (predictive analytics)
Deployment & Licensing
| Tool | License | Self-Hosted | Docker | ARM64 | Language |
|---|---|---|---|---|---|
| Mautic | GPL-3.0 | Yes | Yes | No | PHP/Symfony |
| Listmonk | AGPL-3.0 | Yes | Yes | Yes | Go + Vue |
| Postal | MIT | Yes | Yes | No | Ruby + Go |
| Mailtrain | GPL-3.0 | Yes | Yes | No | Node.js |
| phpList | AGPL-3.0 | Yes | Community | No | PHP |
| Keila | AGPL-3.0 | Yes | Yes | Yes | Elixir |
| MailWizz | Proprietary | Yes | Community | No | PHP |
| Sendy | Proprietary | Yes | Community | No | PHP |
| Mailchimp | Proprietary | No | N/A | N/A | N/A |
| Brevo | Proprietary | No | N/A | N/A | N/A |
| SendGrid | Proprietary | No | N/A | N/A | N/A |
| Amazon SES | Proprietary | No | N/A | N/A | N/A |
| Mailgun | Proprietary | No | N/A | N/A | N/A |
| Postmark | Proprietary | No | N/A | N/A | N/A |
| Constant Contact | Proprietary | No | N/A | N/A | N/A |
| ActiveCampaign | Proprietary | No | N/A | N/A | N/A |
Best lightweight deployment: Listmonk (single Go binary, ~50 MB RAM, ARM64, PostgreSQL only)
Best full-featured self-hosted: Mautic (complete marketing automation, active community, Docker)
Pricing Summary
Self-Hosted
| Tool | License Cost | Hosting Cost | Email Cost |
|---|---|---|---|
| Mautic | Free (GPL-3.0) | Your infra | Your SMTP or SES |
| Listmonk | Free (AGPL-3.0) | Your infra | Your SMTP or SES |
| Postal | Free (MIT) | Your infra | Your IPs |
| Mailtrain | Free (GPL-3.0) | Your infra | Your SMTP or SES |
| phpList | Free (AGPL-3.0) | Your infra | Your SMTP or SES |
| Keila | Free (AGPL-3.0) | Your infra | Your SMTP or SES |
| MailWizz | $299 one-time | Your infra | Your SMTP or SES |
| Sendy | $69 one-time | Your infra | SES ($0.10/1K) |
SaaS
| Tool | Free Tier | Entry Paid | Mid Tier | Notes |
|---|---|---|---|---|
| Mailchimp | 500 contacts | $13/mo (500) | $20/mo (500) | Per-contact pricing |
| Brevo | 300/day | $9/mo (5K) | $18/mo (5K) | Per-email pricing |
| SendGrid | 100/day | $20/mo (50K) | $90/mo (100K) | Per-email pricing |
| Amazon SES | 62K/mo* | $0.10/1K emails | Same | Per-email, cheapest |
| Mailgun | Trial only | $35/mo (50K) | $90/mo (100K) | Per-email pricing |
| Postmark | 100/mo | $15/mo (10K) | $50/mo (50K) | Per-email pricing |
| Constant Contact | None | $12/mo (500) | $35/mo (500) | Per-contact pricing |
| ActiveCampaign | None | $15/mo (1K) | $49/mo (1K) | Per-contact pricing |
* = Amazon SES free tier from EC2 instances only
Cheapest at scale: Amazon SES ($0.10/1,000), Sendy ($69 + SES cost), Listmonk (free + SMTP cost)
Best free tier: Brevo (300 emails/day = ~9,000/ month), Amazon SES (62,000/month from EC2)
Best value SaaS: Brevo (lowest entry price with most features), SendGrid (best transactional value)
Tools
19 tools.
ActiveCampaign
ActiveCampaign is a marketing automation platform with an integrated CRM, widely regarded as having the most sophisticated automation builder in the email marketing category.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML
ActiveCampaign CRM
Cloud-native sales + marketing automation suite; evaluated here for CRM and sales pipeline; SaaS-only with Enterprise-gated SSO.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: SAML
Evaluated under CRM / SFA.
Amazon SES
Amazon Simple Email Service (SES) is an infrastructure-level email sending service from AWS. It is the cheapest option for high-volume email delivery, with flat pricing of $0.10 per 1,000 emails regardless of volume.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML
Brevo
Brevo (formerly Sendinblue) is an all-in-one marketing platform that combines email marketing, SMS, WhatsApp messaging, live chat, and CRM into a single service.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML
Constant Contact
Constant Contact is one of the longest-established email marketing platforms, founded in 1995 (as Roving Software) and publicly traded until its acquisition by Endurance International Group in 2015.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML
Erxes (Marketing / Email)
Erxes is an “Experience Operating System” (XOS) that includes marketing automation as one of its core modules. The marketing capabilities cover email campaigns, audience segmentation, form/popup lead capture, and engagement tracking.
License: AGPL-3.0-only (OSS) · Kind: web · Deploy: native · SSO: none
Keila
Keila is a modern, privacy-focused open source newsletter tool built with Elixir and the Phoenix framework.
License: AGPL-3.0-only (OSS) · Kind: web · Deploy: native · SSO: none
Listmonk
Listmonk is a high-performance, self-hosted newsletter and mailing list manager with over 19,000 GitHub stars, making it one of the most popular open-source email tools.
License: AGPL-3.0-only (OSS) · Kind: web · Deploy: native, docker · SSO: OIDC
Mailchimp
Mailchimp is the largest email marketing platform by market share, serving millions of users worldwide. It was acquired by Intuit in 2021 for approximately $12 billion, integrating it alongside QuickBooks, TurboTax, and Credit Karma.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML
Mailgun
Mailgun is a developer-focused email delivery platform specializing in transactional and bulk email via a powerful REST API and SMTP relay.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML
Mailtrain
Mailtrain is a self-hosted newsletter application built on Node.js and Nodemailer, with approximately 5,700 GitHub stars.
License: GPL-3.0-only (OSS) · Kind: web · Deploy: native, docker · SSO: none
MailWizz
MailWizz is a feature-rich, self-hosted email marketing application sold as a one-time purchase on Envato CodeCanyon.
License: Proprietary (proprietary) · Kind: web · Deploy: native · SSO: none
Mautic
Mautic is the world’s largest open-source marketing automation platform, with over 9,000 GitHub stars and a global community of developers and marketers.
License: GPL-3.0-only (OSS) · Kind: web · Deploy: native, docker · SSO: none
Mautic (Lead Management)
Open-source marketing automation and lead management; PHP / Symfony with MariaDB or MySQL; SAML SSO built-in.
License: GPL-3.0-only (OSS) · Kind: web · Deploy: docker, native · SSO: SAML
Evaluated under CRM / SFA.
phpList
phpList is one of the oldest and most established open source newsletter and email marketing platforms, in active development since 2000. The project claims to have powered the delivery of billions of emails over its 25+ year history.
License: AGPL-3.0-only (OSS) · Kind: web · Deploy: native · SSO: none
Postal
Postal is a fully featured open-source mail delivery platform with over 16,000 GitHub stars, designed as a self-hosted alternative to commercial transactional email services like SendGrid, Mailgun, or Postmark.
License: MIT (OSS) · Kind: web · Deploy: native, docker · SSO: none
Postmark
Postmark is a transactional email specialist renowned for industry-leading deliverability and speed.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML
SendGrid
SendGrid is the industry-standard platform for transactional email and a leading email API provider.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML
Sendy
Sendy is a lightweight, self-hosted newsletter application designed as a cost-effective frontend for Amazon Simple Email Service (SES).
License: Proprietary (proprietary) · Kind: web · Deploy: native · SSO: none
