Complete guide to installing, activating, and using NebulaSend
Visit nebulasend.com/download and click "Download Now". Save NebulaSend_Setup.exe to your computer.
Right-click the installer and select "Run as Administrator". Click "Yes" when Windows asks for permission.
C:\Program Files\NebulaSend)Check "Launch NebulaSend" and click "Finish", or double-click the desktop shortcut.
The license dialog will appear automatically if no license is found.
Paste the license key you received via email (format: NEBULA-XXXX-XXXX-XXXX-XXXX) and click "Activate License".
The app will validate your key and bind it to your computer's hardware. This takes 2-3 seconds.
nebula.license is created in the installation folder. Do not delete or modify this file.
| Error Message | Solution |
|---|---|
| "Invalid license key" | Check for typos. Copy-paste directly from email. |
| "License expired" | Renew your subscription on the pricing page. |
| "License locked to another device" | Contact support to transfer your license. |
| "Server unreachable" | Check your internet connection. Firewall may be blocking port 8000. |
NebulaSend accepts two file formats:
Three columns: email, name, company (no header)
john@example.com,John Doe,Acme Corp
jane@site.com,Jane Smith,TechNova
One email per line
john@example.com
jane@site.com
In the right panel, click the "Load" button and select your CSV/TXT file.
Fill in the subject line and HTML body. Use placeholders {name}, {email}, {company} for personalization.
| Option | Description |
|---|---|
| Rotate From | Cycle through multiple From Names (separate with |) |
| Rotate Subject | Cycle through multiple subjects (separate with |) |
| HTML Randomization | Low/Medium/High - makes each email look unique to spam filters |
The app will begin sending. You'll see live logs and remaining count update in real-time.
In the "From Name" field, enter multiple names separated by | and check "Rotate From".
Your Company | Your Team | Careers | HR Department
In the "Subject" field, enter multiple subjects separated by | and check "Rotate Subject".
Hello {name}! | Update for {name} | Important message for {name}
Check "🎨 HTML Rand" and select intensity:
Click "Preview" to see how your email will look in a browser before sending.
The right panel shows:
📅 used/limit - color-coded (gray/yellow/red)When you reach your daily limit:
Click "Export" to save sending logs to a text file with timestamp, license info, and daily totals.
| Issue | Solution |
|---|---|
| App won't start | Run as Administrator. Check antivirus quarantine. |
| "No SMTP servers assigned" | Validate license again. Contact support if persists. |
| Sending is slow | This is intentional (200 emails/hour per SMTP). Upgrade plan for more SMTPs. |
| Emails going to spam | Enable HTML Randomization. Check your content quality. |
| License dialog keeps appearing | Delete nebula.license and re-activate. |
Ctrl + L - Load recipientsCtrl + S - Save campaignCtrl + O - Load campaignCtrl + E - Export logsCtrl + P - Preview HTMLF5 - Start sendingF6 - Stop sendingC:\NebulaSend_Setup.exeC:\Program Files\NebulaSend\C:\Program Files\NebulaSend\nebula.licenseC:\Program Files\NebulaSend\logs\ (if enabled)