Qualisend is an email verification and deliverability platform that protects your sender reputation and helps your emails reach the inbox.
Email verification checks every address through syntax, domain and MX, disposable and role detection, typo suggestions, catch-all detection, and a real SMTP mailbox probe. Each address gets a clear verdict: deliverable, risky, undeliverable, or unknown. Catch-all domains are reported honestly instead of being marked valid. You can verify single addresses, upload lists of up to 1 million contacts, or clean lists in place inside 30+ connected tools, including Klaviyo, Mailchimp, HubSpot, and Omnisend. New signups can also be verified in real time.
Deliverability tools help you keep your sending infrastructure healthy. You can check SPF, DKIM, and DMARC setup, generate DNS records (SPF, DMARC, BIMI, MTA-STS), analyze email headers, and look up SMTP codes. Blacklist monitoring watches your domains and IPs across major DNSBLs and alerts you when a listing changes.
For developers, Qualisend offers a REST API with webhooks and an MCP server, so you can use it from Claude, ChatGPT, Cursor, and other AI assistants.
Credits never expire on pay-as-you-go plans, and you can start for free without a card.
