email_migration/README.md

# Email Migration Script

A Python script to migrate emails from one IMAP account to another with flexible folder organization and dual authentication support.

## Features

- **Flexible Import Options**: Choose between organized folder structure or consolidated inbox
- **Dual Authentication**: Supports both username and email-based login methods
- **Folder Filtering**: Include/exclude specific folders from migration
- **Metadata Preservation**: Maintain email flags, dates, and other metadata
- **Batch Processing**: Configurable batch sizes for optimal performance
- **Comprehensive Logging**: Detailed logs for monitoring and troubleshooting
- **SSL Security**: Secure connections with SSL/TLS support
- **Provider Compatibility**: Works with various email providers and hosting services

## Quick Start

1. **Install**: No dependencies required - uses Python standard library
2. **Configure**: Copy `.env.template` to `.env` and add your email credentials
3. **Run**: `python3 email_migration.py`

## Requirements

- Python 3.6+ (pre-installed on Linux & macOS)
- IMAP access enabled on both email accounts
- Email account credentials (username/email and password)

## Authentication Methods

The script supports flexible authentication with four possible configurations:

### Option 1: Email-based Login (Most Common)
```env
SOURCE_EMAIL=user@domain.de
SOURCE_USERNAME=
```
**Used by**: Gmail, Yahoo, Outlook, most modern providers

### Option 2: Username + Email (Dual Method)
```env
SOURCE_EMAIL=user@domain.de
SOURCE_USERNAME=mail_user123
```
**Used by**: Some hosting providers - tries username first, falls back to email

### Option 3: Username-only Login
```env
SOURCE_EMAIL=
SOURCE_USERNAME=mail_user123
```
**Used by**: Legacy systems, some cPanel hosting where email is unknown

### Option 4: Email-only Login
```env
SOURCE_EMAIL=user@domain.de
SOURCE_USERNAME=
```
**Used by**: When you're certain email authentication is the only method

**Requirements**: You must provide either SOURCE_EMAIL or SOURCE_USERNAME (or both). Same applies to destination settings.

## Import Folder Options

### Option 1: Organized Import (Recommended)

```env
IMPORT_FOLDER_NAME=Imported
```

**Result**: All source folders become subfolders within "Imported"
- Source `INBOX` → Destination `Imported/INBOX`
- Source `Sent` → Destination `Imported/Sent`
- Source `Drafts` → Destination `Imported/Drafts`

**Benefits**: 
- Preserves original folder structure
- Keeps imported emails separate from existing emails
- Easy to locate and organize imported content

### Option 2: Consolidated Import

```env
IMPORT_FOLDER_NAME=
```

**Result**: All emails go directly to destination INBOX
- All source folders → Destination `INBOX`

**Benefits**:
- Simple single-folder result
- Useful for merging multiple accounts
- Good for basic email consolidation

## Configuration Guide

### Host Europe to Securehost.de Migration Example

```env
# Source: Host Europe
SOURCE_IMAP_SERVER=wp123456.mail.server-he.de
SOURCE_IMAP_PORT=993
SOURCE_EMAIL=user@olddomain.de
SOURCE_USERNAME=mail_account_name
SOURCE_PASSWORD=your_hosteurope_password
SOURCE_IMAP_USE_SSL=True

# Destination: Securehost.de
DEST_IMAP_SERVER=mail.securehost.de
DEST_IMAP_PORT=993
DEST_EMAIL=user@securehost.de
DEST_USERNAME=
DEST_PASSWORD=your_securehost_password
DEST_IMAP_USE_SSL=True

# Import with organization
IMPORT_FOLDER_NAME=HostEurope_Migration
```

### Common IMAP Servers

| Provider | IMAP Server | Port | SSL | Authentication |
|----------|-------------|------|-----|----------------|
| Host Europe | `wpXXXXXX.mail.server-he.de` | 993 | Yes | Username or Email |
| Securehost.de | `mail.securehost.de` | 993 | Yes | Email (typical) |
| Gmail | `imap.gmail.com` | 993 | Yes | Email + App Password |
| Outlook/Hotmail | `outlook.office365.com` | 993 | Yes | Email + App Password |
| Strato | `imap.strato.de` | 993 | Yes | Email |
| 1und1/IONOS | `imap.1und1.de` | 993 | Yes | Username@domain |
| All-Inkl | `mail.all-inkl.com` | 993 | Yes | Username (varies) |

### Authentication Setup

**Host Europe**:
1. Get server name from Host Europe KIS: `wpXXXXXX.mail.server-he.de`
2. Use email account name as username OR enable Easy-Mail-Login to use email
3. Check KIS for exact authentication method

**Securehost.de**:
1. Server typically: `mail.securehost.de` or `mail.yourdomain.de`
2. Usually uses email-based authentication
3. Contact support if unsure about authentication method

**Gmail/Yahoo/Outlook**:
1. Must use app passwords (not regular passwords)
2. Enable IMAP access in account settings
3. Use email address for authentication

## Advanced Configuration

### Folder Filtering

```env
# Only migrate specific folders
INCLUDE_FOLDERS=INBOX,Sent,Important

# Skip unwanted folders  
EXCLUDE_FOLDERS=Trash,Spam,Junk
```

### Performance Tuning

```env
# Batch size (emails per batch)
BATCH_SIZE=50          # Default balance
BATCH_SIZE=10          # Conservative (slow connections)
BATCH_SIZE=100         # Aggressive (fast connections)

# Connection timeout
IMAP_TIMEOUT=60        # Default
IMAP_TIMEOUT=120       # Slow connections
```

### Logging and Debugging

```env
LOG_LEVEL=INFO         # Normal operation
LOG_LEVEL=DEBUG        # Detailed troubleshooting
LOG_LEVEL=ERROR        # Errors only
```

## Usage Examples

### Example 1: Host Europe to Securehost.de with Organization
```bash
# .env configuration
SOURCE_IMAP_SERVER=wp987654.mail.server-he.de
SOURCE_EMAIL=old@company.de
SOURCE_USERNAME=company_mail
DEST_IMAP_SERVER=mail.securehost.de
DEST_EMAIL=new@company.de
IMPORT_FOLDER_NAME=HostEurope_Backup

# Run migration
python3 email_migration.py
```

### Example 2: Test Migration (INBOX only)
```bash
# .env configuration  
INCLUDE_FOLDERS=INBOX
BATCH_SIZE=10
LOG_LEVEL=DEBUG

# Run migration
python3 email_migration.py
```

### Example 3: Consolidate Multiple Accounts
```bash
# .env configuration
IMPORT_FOLDER_NAME=
# This puts all emails in main INBOX

# Run migration
python3 email_migration.py
```

## Monitoring Progress

The script provides detailed logging in multiple places:

1. **Console Output**: Real-time progress updates
2. **Log File**: `email_migration.log` with detailed information
3. **Final Summary**: Complete migration statistics

Example output:
```
Email Migration Script
==================================================
[INFO] Import folder configuration: All emails will be imported to subfolders within "Imported"
[INFO] Connected to wp123456.mail.server-he.de using username: mail_account
[INFO] Connected to mail.securehost.de using email: user@securehost.de
[INFO] Found 5 folders to process
[INFO] Processing folder: INBOX
[INFO] Migrating 'INBOX' -> 'Imported/INBOX'
[INFO] Downloaded 150/150 messages from INBOX
[INFO] Uploaded 150/150 messages to Imported/INBOX
[INFO] Folder 'INBOX' -> 'Imported/INBOX' completed: 150 downloaded, 150 uploaded

Migration completed!
Folders processed: 5
Total emails downloaded: 1250
Total emails uploaded: 1250
Errors encountered: 0
```

## Troubleshooting

### Common Issues

**Authentication Failed**
- Try different authentication combinations:
  - Email only: Set `SOURCE_USERNAME=` (empty)
  - Username only: Set `SOURCE_EMAIL=` (empty) 
  - Both: Provide both values for fallback
- Verify server address from your hosting provider
- For Host Europe: Get exact server name from KIS panel
- For Gmail/Yahoo: Use app passwords, not regular passwords
- Enable IMAP access in email account settings

**Connection Timeout**
- Increase `IMAP_TIMEOUT` value
- Reduce `BATCH_SIZE` for stability
- Check network connection
- Verify server address and port

**Username vs Email Login Issues**
- Try all combinations:
  1. Email only: `SOURCE_EMAIL=user@domain.de`, `SOURCE_USERNAME=`
  2. Username only: `SOURCE_EMAIL=`, `SOURCE_USERNAME=username123`  
  3. Both (fallback): Provide both values
- For Host Europe: Check if Easy-Mail-Login is enabled
- Contact your hosting provider for authentication method
- Check provider documentation for login format

**Folder Creation Failed**
- Verify destination account has folder creation permissions
- Check for special characters in folder names
- Some providers have folder name restrictions

**Partial Migration**
- Check logs in `email_migration.log`
- Re-run script - it will skip already migrated emails
- Use `INCLUDE_FOLDERS` to retry specific folders

### Provider-Specific Troubleshooting

**Host Europe**:
- Server format: `wpXXXXXX.mail.server-he.de` (get exact name from KIS)
- Username: Use email account name from KIS or enable Easy-Mail-Login
- SSL: Port 993 recommended, port 143 with TLS also supported

**Securehost.de**:
- Server typically: `mail.securehost.de` or `mail.yourdomain.de`
- Authentication: Usually email-based, contact support if unsure
- SSL: Port 993 standard

**Gmail/Outlook**:
- Must generate app passwords from account security settings
- Regular passwords won't work due to security restrictions
- Enable IMAP in account settings first

### Getting Help

1. **Enable Debug Logging**: Set `LOG_LEVEL=DEBUG`
2. **Check Log File**: Review `email_migration.log`
3. **Test Small First**: Use `INCLUDE_FOLDERS=INBOX` and `BATCH_SIZE=10`
4. **Verify Credentials**: Test account access with email client first
5. **Try Both Auth Methods**: Test with and without username

## Security Notes

- Never commit `.env` file to version control
- Use app passwords for Gmail, Yahoo, Outlook instead of account passwords
- Ensure SSL is enabled (`*_IMAP_USE_SSL=True`)
- Store credentials securely
- Test with non-critical accounts first
- Enable two-factor authentication where supported

## File Structure

```
email_migration/
├── email_migration.py     # Main script
├── .env.template         # Configuration template
├── .env                  # Your configuration (create from template)
├── email_migration.log   # Generated log file
├── temp_emails/          # Temporary files (auto-created)
└── README.md            # This file
```

## Migration Best Practices

1. **Test First**: Always test with a small subset of emails first
2. **Backup**: Ensure you have backups of important emails
3. **Network**: Use stable internet connection for large migrations
4. **Authentication**: Verify login credentials work before starting
5. **Monitoring**: Watch logs during migration for any issues
6. **Cleanup**: Clean up temporary files after successful migration

## License

This script is provided as-is for educational and personal use. Test thoroughly before production use.