Dead addresses are eating your sends.

“The night before a 300k campaign I ran a sample and nearly fell out of my chair — a third of it was dead. We verified the whole list and cut it in an afternoon. The reason codes meant I could show the client why each row died instead of waving at an accuracy score.”

“The probe gets throttled by Gmail sometimes and the API just says so. Annoying. Also honest. After two campaigns that hit spam, that honesty is exactly what I needed.”

“Dead domains used to sit on our list for months, and we found out when our deliverability tanked. Now we verify every signup at the edge — one POST, a reason, a score. It replaced a service that cost us four times as much and told us less.”

“I've had campaigns flagged because one vendor swore an address was fine and another said it was dead. This was the only verifier where I could re-run a disputed row and get the same verdict. Reproducibility is the whole game.”