SMTP Diag Tool alternatives

SMTP Diag Tool is a proprietary app for Windows. It is free to use. Developed by Spam10 / AdminKit.net.

Alternatives

• Pingdom
• MxToolBox
• Uptime.com
• Upzilla
• intoDNS
• Pingbreak
• Dnsstuff
• Curler by Amixr.IO
• Netthrob
• Silent Down
• Lean20 Ping
• Status List