Sniffmail
Verify emails exist before they enter your system.
Sniffmail is an email verification API that checks addresses in real time before they enter a system, helping reduce bounce rates, block fake signups, and protect sender reputation. It runs a four-step pipeline: RFC syntax validation, domain and MX record checks, disposable email detection, and SMTP mailbox verification.
Integration is available through a REST API, an npm package for Node.js and TypeScript with built-in caching and local disposable detection, and Zapier for no-code workflows. It connects with tools such as Shopify, Mailchimp, HubSpot, Stripe, Airtable, and Google Sheets. The free plan covers syntax, MX, and basic disposable checks, while deep SMTP verification and extended disposable detection require a paid plan.
Sniffmail is aimed at developers and teams handling SaaS signups, marketing list cleaning, fraud prevention, e-commerce checkouts, and marketing automation. Packaging includes a free tier with monthly basic verifications, pay-as-you-go credit packs that never expire, and subscription plans with monthly or annual billing and overage charges.
12 alternatives to Sniffmail
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