13 SMTP Tools to Diagnose and Test Email Security
geekflare.com › smtpDec 09, 2021 · SocketLabs offers a free tool for SMTP testing, diagnostics, and monitoring that is free to use and download. It helps you to test and troubleshoot SMTP connections. The tool supports both secure (SSL) and open SMTP server connections. It contains an in-built library of commands like DATA, EHLO, RCPT TO, and more.