SMTP Diag Tool vs ZoneAlarm Firewall
A side-by-side look at SMTP Diag Tool and ZoneAlarm Firewall. For an in-depth review of either product, follow the links below.
SMTP Diag Tool
Network & Admin
SMTP Diag Tool is a free, open-source Windows application used to diagnose issues with sending and receiving emails. It can test SMTP servers, validate email addresses, verify DNS records, and check for common email delivery problems.
smtpemaildiagnostictroubleshooting
ZoneAlarm Firewall
Security & Privacy
ZoneAlarm Firewall is a free personal firewall program that helps protect your computer from hackers and cyber criminals. It monitors incoming and outgoing traffic and blocks threats while allowing desired connections.
firewallnetwork-securityintrusion-prevention
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