Validate and clean email lists to prevent costly bounces
High bounce rates trigger ISP spam filters and degrade your domain reputation. Mailofly verifies recipient validity in real time via API or bulk audience uploads.
Target bounce rate
Syntax & MX verification
Reputation protection
Engineered for developer velocity
Syntax & RFC compliance
Catches typos, formatting errors, and invalid domain structures before an email is ever dispatched.
Live MX & mailbox probing
Checks destination mail server DNS and confirms receiving mailboxes exist without sending unwanted ping messages.
Disposable & spam-trap filtering
Automatically detects throwaway addresses, role-based inboxes (admin@, support@), and known spam traps.
How it works
Upload list or call API
Import a CSV audience file or validate recipient addresses inline before sending via our REST API.
Automated verification checks
Mailofly runs multi-layer checks: syntax, MX records, SMTP handshake verification, and disposable domain lists.
Dispatch with confidence
Exclude undeliverable contacts automatically and send to verified recipients with rock-solid inbox placement.
Explore related features
SDKs for every language
First-class, strictly typed client libraries engineered for developer happiness. Send transactional messages, query logs, and manage contacts with idiomatic syntax.
Mailofly AI & Native MCP
Integrate Mailofly directly with your AI development workflows. Run our native Model Context Protocol (MCP) server or chat with Mailofly AI for real-time domain audits and template optimization.
Smart dynamic routing
Intelligently routes traffic to the fastest regional servers and fallback SMTP providers based on ISP latency and deliverability health.
Ready to build with Email list validation & verification?
Join thousands of engineering teams delivering transactional and lifecycle email with blazing speed and zero downtime.