Speed SMTP Scanner v2.5 Registered is a type of software tool that is designed to scan multiple IP addresses and ports for open SMTP servers.

The purpose of such a tool is to identify vulnerable or misconfigured SMTP servers that can be exploited by spammers or attackers to send large volumes of unsolicited emails (also known as spam) or conduct other types of malicious activities such as phishing scams.

However, it’s worth noting that the use of such tools for unauthorized scanning or hacking activities is illegal and can result in serious legal consequences. It’s important to use such tools only for legitimate and authorized purposes and with the proper consent of the target system’s owner.