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uChecker checks email lists in bulk. Upload a .txt or .csv with up to 9 million addresses in one job. Dead domains drop out automatically and are not billed. Speed is about 3200 addresses a minute. Results come back as Good, Bad and Risk, as an archive or as JSON. The mail server's full response is stored for each address, so a deleted mailbox, a frozen account and a mailbox over quota stay different answers. Addresses that cannot be checked go to Unknown and are never counted as valid. Use the dashboard at app.uchecker.net, the REST API at api.uchecker.net/docs, or the Telegram bot. There is an MCP endpoint for agents. 100 free validations to try. 13 free email DNS tools with no account at https://uchecker.net/tools.

Mailsnappy is an email marketing platform that helps businesses create, send, automate, and track professional email campaigns. It includes customizable templates, audience segmentation, campaign analytics, and AI-powered email design tools to make email marketing faster and easier.

Audienceful — simple, powerful email marketing. Most email platforms make you fight through clunky editors and buried settings before you can send a single newsletter. Audienceful skips all that. Its block style editor with quick commands lets you just start writing, and your emails come out looking custom and on-brand. Underneath, it has everything you need: audiences, tagging, segmentation, automations, analytics, transactional email, and native integrations for all your tools. Made for businesses who want to send great email without the bloat.

Clear Mail for Gmail gives business teams a faster, more structured way to manage high-volume inboxes - directly inside Gmail, with no disruption to existing workflows. For organizations relying on Gmail as a core communication tool, inbox clutter isn't just an inconvenience - it creates missed messages, slower response times, and wasted hours. Clear Mail solves this problem. ▸ Zero-install deployment: Runs as a Chrome extension inside Gmail, requiring no desktop software or third-party platforms ▸ Enterprise-grade privacy: Designed with a privacy-first approach - your email data stays yours ▸ Intelligent Mail Filters: Build structured views of your inbox based on sender, subject patterns, and categories - making it easy to prioritize or take bulk-action ▸ Cross-tab inbox control: Covers Primary, Promotions, Social, Updates, and Forums tabs for end-to-end inbox hygiene ▸ Bulk deletion tools: Delete All and Super Delete features reduce manual inbox management from a recurring time sink to a one-click operation Whether you're managing a personal inbox or a business account, Clear Mail helps declutter in a privacy-first way.

Broadcast is self-hosted email marketing software for developers, agencies, and technical founders who would rather own their email platform than rent it. You install Broadcast on your own server, connect the email provider you already use, and send. The license is a one-time payment. There is no per-subscriber pricing and no monthly bill, so a list that grows from 500 to 500,000 costs the same to license. Broadcast covers the full campaign workflow: broadcast emails, drip sequences, automation via Autopilot, subscriber management, segmentation, opt-in forms, reusable templates, link tracking, and open and click metrics. It also ships a full REST API with official Ruby, Python, PHP, and Node SDKs, a CLI, and MCP support for AI agents. Because you run the server, subscriber data never leaves infrastructure you control, which is why Broadcast is a common answer for teams with GDPR or data residency requirements. Broadcast integrates with Amazon SES, Postmark, Mailgun, and SendGrid, and with any SMTP provider. Two one-time licenses are available: a Regular License at $250 for one server, and an Extended License at $1,000 for up to 25 servers. Both include unlimited subscribers, every feature, and a 30-day money-back guarantee.