Free, fast, no-login email validity checker. Paste an email address, and we’ll check syntax, domain & MX records, flag disposable providers and typos, and optionally run a safe SMTP deep check without sending email. You can copy the results and validate more addresses in seconds.

Sidemail Email MCP Server connects AI tools like Claude, VS Code, Cursor, or Windsurf to your email stack. Ask your agent to set up transactional email sending, write newsletters, manage contacts and groups, or verify sending domains – all via MCP, backed by Sidemail’s proven email infrastructure.

Sidemail is all-in-one email delivery platform for startups. It has everything for delivering and managing emails – email API, transactional emails, email marketing and automation, contact management, email templates, subscribe forms, and more. Perfect for teams & developers that want reliable deliverability without the bloat. We're based in the EU and GDPR compliant.

Upload a CSV and it’ll validate your email addresses by checking syntax, DNS/MX, disposable, typos, and optionally perform a safe SMTP handshake. Great for list cleaning, cutting bounces, and protecting your sender reputation. It's free, online, and no signup.

What's your customer and MRR churn? Calculate your churn fast with this free calculator (including retention, net growth rate, GRR, NRR) and generate a nice shareable JPG from the results that you can use for investor updates, standups, or social posts.

Robolly is an all-in-one service for automated image, video & PDF generation. The potential is limitless; you can use it to generate branded social media content, open graph images, PDF certificates, personalized videos, slideshows, and so much more.