For legitimate network auditing, modern and actively maintained tools are recommended: 0;16; 0;5ed;0;5bb;
: Scanners check common SMTP ports such as 25 (standard), 587 (TLS), and 465 (SSL). Smtp Scanner Hscan 1.2 Download
A standard network security tool that can be used with specific scripts (like smtp-open-relay ) to test SMTP servers for vulnerabilities. For legitimate network auditing