Trumailo
Intelligent email verification. More engagement, less hassle
Trumailo launched on August 8, 2025 with 6 votes. The site was still online in September 2026, 1 year on.
What it does
Trumailo helps you verify and clean your email lists with fast, reliable, and secure email checking. Improve deliverability and protect your sender reputation.
Email verification API with eight deliverability signals per address. Real SMTP handshake, catch-all probe, disposable + role detection, provider mapping. Cached responses under 10ms. Open source, free during beta.
Trumailo runs every signal that decides whether your email arrives, then tells you what it learned and how confident it is. Real SMTP handshake. Catch-all probe. Provider mapping. Cached responses under ten milliseconds. Most verifiers stop at format and MX. We go all the way to the recipient’s SMTP server, then surface the verdict, the reason, and the confidence in one flat JSON envelope. Three layers, optimised for the path most requests actually take. Cached lookups complete in single-digit milliseconds. Heavy SMTP work runs async on a NATS queue without blocking your response. Result hashes get stored, never the raw addresses. Redis-backed. 6 to 24 hour TTLs per signal class. Sub-10ms…from trumailo.com
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