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Catalog
Free to startMarketing
MailerSend is a transactional email platform with SMTP relay, email API, inbound routing, SMS, and drag-and-drop template tooling. It focuses on developers and product teams delivering notifications, receipts, and lifecycle messages with deliverability tooling.
Free planWriting
MailFast is an AI email writing assistant that drafts professional messages from short prompts with tone control, templates, grammar checks, and 50+ language support. The homepage targets professionals who want faster composition inside existing clients like Gmail and Outlook.
Free planEmail API
Mailgun is a Sinch email platform providing REST and SMTP APIs to send, receive, track, and validate transactional email at scale. Plans range from a free daily quota through Basic, Foundation, and Scale tiers with optional validations and dedicated IPs.
Free planCode
Mailinator provides disposable and private email inboxes for QA automation, SMS workflow testing, and developer integrations. Teams use public inboxes or verified private domains with API access to validate signup, OTP, and password-reset flows.
Free trialWriting
Mailivery is an email warm-up and deliverability suite that connects unlimited mailboxes while sharing daily warm-up volume across Starter, Professional, and Business plans. Every tier bundles blacklist monitoring, verification credits, inbox placement tests, and supporting deliverability tools with a seven-day trial.
Free tier unknownMarketing
Mailjet (Sinch Mailjet) combines email marketing and transactional delivery with drag-and-drop editors, automation, segmentation, and developer APIs. It adds AI-assisted content tools and integrations with ecommerce and CRM platforms for collaborative sending teams.
Free planWriting
Mailscribe hosts free email marketing utilities and guides such as email verification, SMTP testing, and subject line generation without signup. The site also publishes a blog and FAQ resources aimed at campaign planning, deliverability, and conversion workflows for email marketers.
Free planAssistant
GNU Mailman is free software for managing email discussion lists and newsletters, integrating with the web so subscribers and list owners can administer memberships, archives, bounces, digests, and spam filtering.
Free to startWriting
MailOptimal is an email outreach and deliverability platform combining AI sequences, unlimited mailboxes, warmup, placement tests, unified inbox CRM, and lead finding. Public pricing tiers scale campaign and warmup email volumes for founders through enterprise senders, with InfraOptimal dedicated-IP mailboxes advertised separately.
Free to startEmail Client
Mailpile is a privacy-focused, open source email client and personal webmail server designed for search, encryption, and self-hosting. The team is rewriting the codebase for Python 3 and exploring dedicated hardware while prior releases remain unavailable.
Free planWriting
Mailr is a Chrome extension AI email assistant acquired by MailWiz that drafts messages and replies from a goal and tone in one click. The site still offers a free tier with word limits and a Premium Tier subscription for higher monthly word allowances and faster generation.
Free to startWriting
MailReply is a macOS menu bar assistant that generates ready-to-send AI replies for the email you are reading, then inserts them with a keyboard shortcut. It supports multiple tones, learns user style, works across mail apps, and offers a built-in demo before weekly Pro or Max subscriptions.
Free planImages
Mails.ai provides email API and infrastructure for AI agents with structured inbound events, injection scanning, reputation scoring, MCP server access, and SDKs. Pricing tiers meter combined send and inbound event volume with custom domains on paid plans and workspace subdomains on the free tier.
Free planCode
Mailsac offers disposable and private test email addresses with a REST API for QA automation. Developers can use public @mailsac.com inboxes instantly or upgrade for private domains, higher volume, and unified inbox tooling.
Free tier unknownWriting
Mailshake is a sales engagement platform for B2B outreach that combines email automation, AI copywriting (SHAKEspeare AI), deliverability tools, follow-ups, a dialer, and CRM integrations. Teams use it to run cold email sequences, verify leads, and book meetings from one workspace.
Free planWriting
Mailteorite generates AI email templates and campaigns for SaaS, promotional, newsletter, welcome, and event use cases from a chat-style picker. Paid plans raise daily AI credits, sending limits, brand kits, and integrations with providers like Mailgun, Resend, SendGrid, and Postmark.
Free planWriting
Mailtester.ai scores newsletter deliverability by letting senders forward a test message and receive placement, server checks, and plain-English fixes in about 30 seconds. Forwarding tests are free and unlimited while AI deep-dives consume credits or monthly euro subscriptions for frequent senders.
Free planWriting
MailTester Ninja is an email checker and verifier that validates addresses in real time without sending mail, aiming to cut bounces and protect sender reputation. The site stresses that checks store nothing and offers related deliverability tools plus API access for higher volumes.
Free to startEmail Assistants
Mailthy organizes incoming enquiries for building suppliers and contractors using AI classification and information extraction. It identifies material, quantity, dates and missing details, assigns messages by the business’s rules and prepares reply drafts. Owners choose which replies require review and which routine messages may send automatically.
Free planMailTime is a mobile email client that presents messages as chat-style conversation bubbles instead of traditional threads. It aggregates Gmail, Outlook, Yahoo, iCloud, and other accounts in one app while keeping outbound messages compatible with standard email clients.
Free planEmail Delivery
Mailtrap is an email delivery platform with separate products for sandbox testing, transactional Email API/SMTP sending, and marketing campaigns. It targets developers and product teams with logs, templates, analytics, and AI-agent inbound workflows.
Free tier unknownEmail deliverability
Mailwarm is an email warm-up service that sends positive engagement signals from real inboxes to improve sender reputation and inbox placement. It supports Gmail, Outlook, Yahoo, Zoho, SMTP providers, and includes deliverability expert guidance on every plan.
Free tier unknownAI agent sandboxes
Mainbrella provides API-managed Linux workspaces for AI agents to execute commands, transfer files and open web previews. Applications can select runtime images, inspect stdout and exit codes, or connect by SSH and a browser terminal. Fixed monthly plans cap compute and sessions, while saved-workspace features preserve selected filesystem state.
Free planAutomation
Make (formerly Integromat) is a visual automation platform for connecting apps, data, and AI steps into scenarios. Teams design multi-step workflows on a canvas, meter usage in credits, and scale from personal integrations to organization-wide automation with agents and scheduling controls.
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