SMTP Diagnostics for Windows

Used SMTP Diagnostics for Windows?

Editors’ Review

Download.com staffFebruary 26, 2026

This program helps diagnose outgoing mail server problems. Send test messages, view protocol logs, and analyze issues with your SMTP connection.

Top Recommended Alternative

EmailAdept DBX Viewer

Trial version

Pros
- Assists with troubleshooting outgoing mail problems
- Send test messages with or without attachments
- View protocol messages exchanged with the mail server
- Helps analyze problems
- Provides information for technical support
Cons
- Focuses solely on outgoing mail
- No mention of incoming mail diagnostics
- Does not automatically resolve issues
- Requires manual analysis of protocol logs

SMTP Diagnostics for Windows

Used SMTP Diagnostics for Windows?

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Full Specifications

GENERAL

Release: July 14, 2007

Latest update: February 26, 2026

Version: 1.8.0-build-74

OPERATING SYSTEMS

Platform: Windows

Operating System

Windows 2000
Windows Vista
Windows XP
Windows 98
Windows ME
Windows 10

Additional Requirements: None

POPULARITY

Total Downloads: 4,945

Downloads Last Week: 1

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User Reviews

5/5

1 User Votes

Excellent smtp connection tester!
Larry HatfieldAugust 10, 2011
Pros
Displays everything about the email transaction.
Cons
Would like a portable version for my flash drive.
Summary
Color highlighting of errors/deny/rejects would be helpful.

Developer’s Description

By White Peak Software

Diagnose and troubleshoot outgoing e-mail or SMTP server issues.