Email Tester - Test email settings quick and fast (Updated Jul 2026)


Description:
Email Tester helps you verify SMTP server settings and troubleshoot outbound email. Enter your server details, test the raw connection, then send a real test message and read a clear, colour-coded log of exactly what happened — including plain-language hints when something goes wrong. It supports SSL/TLS, quick-set buttons for the common ports, multiple recipients with CC and BCC, a plain-text or HTML body, saved server presets, and text or CSV export of your test history.


How to use:
1. Enter the server details. In the Server section, fill in the SMTP Host, Port, Username and Password, and tick Enable SSL if your server uses TLS. Use Show to reveal the password while typing, and set a Timeout if you want to wait longer or shorter than the default.

2. (Optional) Use a quick port button. The 587, 465, 25 and 2525 buttons set the port and SSL together for you — 587 (STARTTLS), 465 (SSL/TLS), 25 (legacy relay), or 2525 (alternate when 587/465 are blocked).

3. (Optional) Save a preset. Type a name in the Name field and click Save to remember the host, port, SSL and username for next time. Pick a saved preset from the dropdown and click Load to fill the fields back in, or Delete to remove one. (Passwords are never stored in presets.)

4. (Optional) Test the connection. Click Test Connection to check that your computer can reach the server on that port before sending anything. The log confirms success or reports the error, with a hint about whether the port and SSL setting look right.

5. Create the test message. In the Message section, fill in From (and an optional From Name and Reply-To), the To recipients, optional CC and BCC, a Subject and the message Body. You can list several recipients separated by commas or semicolons, and tick HTML body if your message contains HTML.

6. Send and review. Click Send to attempt a real delivery through the server. Progress and the outcome appear in the colour-coded log; click Cancel to stop a send in progress. Any problems are shown in full so you can correct the settings and try again.

7. (Optional) Keep a record. Use Copy Status to copy the log, Clear Log to reset it, or Export TXT / Export CSV to save the history of your test sends (server, port, SSL, from/to, subject, result and notes).

What You Can Do With This Program

Potential Uses for Email Tester Tool:

• Troubleshooting Email Configuration Issues:
  • Quickly diagnose and fix problems with SMTP server settings, port numbers, security protocols (SSL/TLS), or authentication credentials for any email account.
  • Ideal for identifying why an application, device, or email client can't send emails — the log spells out the exact error returned by the server.
  
  
• Verifying New Email Account Setups:
  • Confirm that newly created email accounts or aliases are properly configured and able to send messages before putting them into use.
  
  
• Testing Application-Specific Email Sending:
  • For developers or power users, test the outgoing email settings of custom applications, scripts, or services without needing to integrate complex email libraries or wait for application-specific logs.
  
  
• Pre-Deployment Checks for Servers/Devices:
  • Before deploying a new server, network device, or IoT device that relies on email alerts (e.g., security cameras, monitoring systems), use the tool to ensure its outbound email capabilities are fully functional.
  
  
• Validating Firewall and Network Connectivity:
  • Use Test Connection to determine if firewalls, routers, or internet providers are blocking outbound email ports (like 25, 465, 587, 2525), a common cause of sending failures.
  
  
• Comparing SSL/TLS and Port Combinations:
  • Switch between STARTTLS (587), implicit TLS (465) and alternate ports with a single click to find the combination your provider accepts.
  
  
• Quick "Proof of Concept" for Email Features:
  • When experimenting with new email services or migrating providers, quickly test connectivity and sending capabilities, saving each server as a preset for repeat testing.