Using raw sockets or WinSock, the scanner attempts a TCP handshake with each IP on port 25. If the connection is successful, the server is marked as "SMTP Alive."
The scanner issues the following commands:
MAIL FROM: <test@example.com>
RCPT TO: <test@test.com>
If the server returns 250 OK or similar for RCPT TO to a domain that is not its own, the server is an open relay. Speed Smtp Scanner V2.5 Free Download
The user provides a list of IP addresses or ranges. For example: 185.0.0.0/16. The scanner generates all possible IPs in that range.
Speed SMTP Scanner V2.5 is a software application designed to scan and validate SMTP (Simple Mail Transfer Protocol) servers. It is a crucial tool for anyone involved in email marketing, as it helps in identifying valid SMTP servers that can be used for sending bulk emails. The software is an updated version of its predecessor, offering enhanced features and improved performance. Using raw sockets or WinSock, the scanner attempts
Use rate limiting to block IPs that make too many connections or attempts within a short time. For Postfix:
smtpd_client_connection_rate_limit = 10
smtpd_client_message_rate_limit = 10
Many "cracked" or "free" versions contain hidden payloads. Analysis by security researchers (e.g., ANY.RUN, Hybrid Analysis) has shown that some variants include: If the server returns 250 OK or similar
Speed SMTP Scanner V2.5 is a Windows-based software application designed to scan IP address ranges (IPv4) for hosts running SMTP services on port 25, 465 (SMTPS), or 587 (Submission). Once it identifies a live SMTP server, it can attempt to:
The "V2.5" designation indicates it is an updated version of the original Speed SMTP Scanner, allegedly featuring faster threading, improved proxy support, and better handling of modern SMTP error codes.
A: The tool itself is not illegal in most countries. However, using it against any system without authorization is illegal. Simply possessing it can be used as evidence of malicious intent.