v4.0

# BillionMail v4.0 Release Notes  

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## 🚀 AI-Powered Email Template Editor  
- **Conversational template generation**  
  Create email templates through natural language prompts  
- **Automated website profiling**  
  Extracts information from target sites to build personalized emails  
- **Flexible AI model integration**  
  Supports mainstream AI providers by default; custom integrations can be added  

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## ⚙️ Enhanced Email Sending API  
- **Improved API testing workflow**  
  Added cURL code examples for seamless integration  
- **Resolved intermittent errors** during mass email sending  

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## 📇 Optimized Contact Management  
- **Streamlined editing/deletion logic** for contacts  
- **Overhauled UI** with user experience-focused redesign  
- **Configurable group confirmation**  
  Toggle secondary prompts when adding new contacts to groups  

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## 📈 Key Feature Enhancements  
- **Localized language display** for multilingual lists (shown in native languages)  
- **New invalid email manager** for bounce handling  
- **Custom display names** when adding email accounts  
- **SNI support** added for secure domain hosting  

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## 🐛 Bug Fixes  
- Fixed incorrect SMTP relay server configuration errors  
- Resolved internal IP misidentification in LAN environments  
- Prevented addition of **empty contact groups** to marketing campaigns  
- Corrected CLI tool **displaying IP addresses** after domain configuration  
- Eliminated **test email sending failures**  
- Patched **IP whitelist enforcement** bypass  
- Fixed **infinite loop** in email campaign tasks  
- Addressed unsubscribe links **displaying IPs instead of domains**  
- Reduced **excessive debug logging** caused by incorrect log-level settings  

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## 🛡️ Update Reliability Improvements  
- **Local-config-first merge strategy** to preserve custom settings during upgrades  
- **Graceful update failure handling** to prevent service interruptions  

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## 🔌 Compatibility Upgrades  
- **Full aaPanel compatibility**  
  Seamless installation and operation on aaPanel environments