What this means
Addresses on mailfast.pro are created in seconds, read once and abandoned. People use them to skip newsletters, grab trials or stay anonymous, all legitimate from their side. From a service operator's side they mean unreachable users, instant bounces and skewed metrics, which is why most signup forms block confirmed disposable domains and ask for a permanent address instead.
See something wrong? Blocklists change and mistakes happen: email [email protected] and we will review it against the upstream sources. Our verdicts state list membership only; they are not accusations against the domain owner.