Add dual authentication support and comprehensive provider examples

Core functionality:
- Add dual authentication support (username + email fallback)
- Enhance IMAPConnection to try username first, then email
- Add SOURCE_USERNAME and DEST_USERNAME configuration options
- Improve authentication error handling and logging

Configuration updates:
- Add Host Europe to Securehost.de migration examples
- Include authentication method explanations for various providers
- Add comprehensive provider-specific settings (Host Europe, Securehost.de, etc.)
- Document username vs email login methods with examples

Documentation updates:
- Add dual authentication section in README
- Include Host Europe and Securehost.de specific examples
- Expand troubleshooting section with authentication help
- Add provider-specific troubleshooting guidance
- Include migration best practices

Features:
- Automatic fallback from username to email authentication
- Enhanced logging showing which authentication method succeeded
- Support for various hosting providers and their login requirements
- Improved error messages for authentication failures

.env.template

@@ -20,6 +20,12 @@ SOURCE_IMAP_PORT=993
 # Example: user@yourdomain.de
 SOURCE_EMAIL=user@example-domain.de
 
+# SOURCE_USERNAME: Login username (if different from email)
+# Some providers use separate username for login (e.g. hosteurope123, mail_user)
+# Leave empty if login uses email address
+# Host Europe: often uses email account name or specific username
+SOURCE_USERNAME=
+
 # SOURCE_PASSWORD: Email account password
 # Use your Host Europe email password (NOT app password needed here)
 SOURCE_PASSWORD=your_hosteurope_password
@@ -29,24 +35,30 @@ SOURCE_PASSWORD=your_hosteurope_password
 SOURCE_IMAP_USE_SSL=True
 
 # ============================================================================
-# DESTINATION EMAIL ACCOUNT (migrating TO) - German Hosting Example
+# DESTINATION EMAIL ACCOUNT (migrating TO) - Securehost.de Example
 # ============================================================================
 
 # DEST_IMAP_SERVER: Destination IMAP server
-# Common formats: mail.yourdomain.de | imap.provider.de
+# Securehost.de: mail.securehost.de | Common: mail.yourdomain.de | imap.provider.de
-DEST_IMAP_SERVER=mail.yourdomain.de
+DEST_IMAP_SERVER=mail.securehost.de
 
 # DEST_IMAP_PORT: Destination IMAP port
 # 993 (SSL) | 143 (TLS/STARTTLS)
 DEST_IMAP_PORT=993
 
 # DEST_EMAIL: Your destination email address
-# Example: user@newdomain.de
+# Example: user@securehost.de
-DEST_EMAIL=user@newdomain.de
+DEST_EMAIL=user@securehost.de
+
+# DEST_USERNAME: Login username for destination (if different from email)
+# Some hosting providers use separate username (e.g. user123, cpanel_user)
+# Leave empty if login uses email address
+# Securehost.de: typically uses email or specific username
+DEST_USERNAME=
 
 # DEST_PASSWORD: Destination email password
-# Your hosting provider email password
+# Your securehost.de email password
-DEST_PASSWORD=your_destination_password
+DEST_PASSWORD=your_securehost_password
 
 # DEST_IMAP_USE_SSL: Use SSL for destination
 # True (recommended) | False
@@ -113,30 +125,60 @@ LOG_LEVEL=INFO
 # ./temp_emails (default) | /tmp/emails | C:\Temp\emails
 TEMP_DOWNLOAD_DIR=./temp_emails
 
+# ============================================================================
+# AUTHENTICATION EXAMPLES
+# ============================================================================
+
+# Email-based login (most common):
+# SOURCE_EMAIL=user@domain.de
+# SOURCE_USERNAME=
+# → Script tries: user@domain.de
+
+# Username-based login:
+# SOURCE_EMAIL=user@domain.de
+# SOURCE_USERNAME=mail_user123
+# → Script tries: mail_user123, fallback to user@domain.de
+
+# Host Europe specific:
+# SOURCE_USERNAME=email_account_name  (from Host Europe KIS)
+# SOURCE_USERNAME=                    (if using Easy-Mail-Login)
+
 # ============================================================================
 # PROVIDER-SPECIFIC EXAMPLES
 # ============================================================================
 
-# Host Europe Settings:
+# Host Europe to Securehost.de Migration:
-# SOURCE_IMAP_SERVER=wpxxxxxxxx.mail.server-he.de
+# SOURCE_IMAP_SERVER=wp123456.mail.server-he.de
-# SOURCE_IMAP_PORT=993
+# SOURCE_EMAIL=user@olddomain.de
-# SOURCE_IMAP_USE_SSL=True
+# SOURCE_USERNAME=mail_account_he
-# Note: Replace 'wpxxxxxxxx' with your actual server name from Host Europe KIS
+# DEST_IMAP_SERVER=mail.securehost.de
+# DEST_EMAIL=user@securehost.de
+# DEST_USERNAME=
 
-# Common German Hosting Providers:
+# Host Europe Settings:
-# Strato: imap.strato.de:993
+# Server format: wpxxxxxxxx.mail.server-he.de (get from KIS)
-# 1und1/IONOS: imap.1und1.de:993
+# Port: 993 (SSL) or 143 (TLS)
-# All-Inkl: mail.all-inkl.com:993
+# Username: Check KIS for account name or use email if Easy-Mail-Login enabled
-# Hetzner: mail.your-server.de:993
+
+# Securehost.de Settings:
+# Server: mail.securehost.de (typical format)
+# Port: 993 (SSL recommended)
+# Authentication: Usually email-based, check with provider
+
+# Other German Providers:
+# Strato: imap.strato.de:993 (email login)
+# 1und1/IONOS: imap.1und1.de:993 (username: username@domain)
+# All-Inkl: mail.all-inkl.com:993 (username varies)
+# Hetzner: mail.your-server.de:993 (email login)
 
 # Gmail (if needed):
-# Gmail: imap.gmail.com:993 (requires app password)
+# imap.gmail.com:993 (requires app password, email login)
 
 # ============================================================================
 # MIGRATION EXAMPLES
 # ============================================================================
 
-# Example 1: Host Europe to new hosting with organization
+# Example 1: Host Europe to Securehost.de with organization
 # IMPORT_FOLDER_NAME=HostEurope_Migration
 # Result: Clean separation in destination
 

README.md

@@ -1,15 +1,17 @@
 # Email Migration Script
 
-A Python script to migrate emails from one IMAP account to another with flexible folder organization options.
+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
 
@@ -21,7 +23,27 @@ A Python script to migrate emails from one IMAP account to another with flexible
 
 - Python 3.6+ (pre-installed on Linux & macOS)
 - IMAP access enabled on both email accounts
-- App passwords (recommended for Gmail, Yahoo, Outlook)
+- Email account credentials (username/email and password)
+
+## Authentication Methods
+
+The script supports two authentication methods and automatically tries both:
+
+### Method 1: Email-based Login (Most Common)
+```env
+SOURCE_EMAIL=user@domain.de
+SOURCE_USERNAME=
+```
+**Used by**: Gmail, Yahoo, Outlook, most modern providers
+
+### Method 2: Username-based Login
+```env
+SOURCE_EMAIL=user@domain.de
+SOURCE_USERNAME=mail_user123
+```
+**Used by**: Some hosting providers, older email systems, cPanel hosting
+
+The script automatically tries username first (if provided), then falls back to email authentication.
 
 ## Import Folder Options
 
@@ -57,36 +79,57 @@ IMPORT_FOLDER_NAME=
 
 ## Configuration Guide
 
-### Email Account Setup
+### Host Europe to Securehost.de Migration Example
 
 ```env
-# Source account (migrating FROM)
+# Source: Host Europe
-SOURCE_IMAP_SERVER=imap.gmail.com
+SOURCE_IMAP_SERVER=wp123456.mail.server-he.de
-SOURCE_EMAIL=old@gmail.com
+SOURCE_IMAP_PORT=993
-SOURCE_PASSWORD=your_app_password
+SOURCE_EMAIL=user@olddomain.de
+SOURCE_USERNAME=mail_account_name
+SOURCE_PASSWORD=your_hosteurope_password
+SOURCE_IMAP_USE_SSL=True
 
-# Destination account (migrating TO)  
+# Destination: Securehost.de
-DEST_IMAP_SERVER=imap.gmail.com
+DEST_IMAP_SERVER=mail.securehost.de
-DEST_EMAIL=new@gmail.com
+DEST_IMAP_PORT=993
-DEST_PASSWORD=your_app_password
+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 |
+| Provider | IMAP Server | Port | SSL | Authentication |
-|----------|-------------|------|-----|
+|----------|-------------|------|-----|----------------|
-| Gmail | `imap.gmail.com` | 993 | Yes |
+| Host Europe | `wpXXXXXX.mail.server-he.de` | 993 | Yes | Username or Email |
-| Outlook/Hotmail | `outlook.office365.com` | 993 | Yes |
+| Securehost.de | `mail.securehost.de` | 993 | Yes | Email (typical) |
-| Yahoo | `imap.mail.yahoo.com` | 993 | Yes |
+| Gmail | `imap.gmail.com` | 993 | Yes | Email + App Password |
-| Apple iCloud | `imap.mail.me.com` | 993 | Yes |
+| 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) |
 
-### App Password Setup
+### Authentication Setup
 
-**Gmail**: Google Account → Security → App Passwords  
+**Host Europe**:
-**Yahoo**: Account Security → Generate app password  
+1. Get server name from Host Europe KIS: `wpXXXXXX.mail.server-he.de`
-**Outlook**: Account Security → App passwords  
+2. Use email account name as username OR enable Easy-Mail-Login to use email
+3. Check KIS for exact authentication method
 
-⚠️ **Important**: Use app passwords, not regular login passwords!
+**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
 
@@ -123,13 +166,15 @@ LOG_LEVEL=ERROR        # Errors only
 
 ## Usage Examples
 
-### Example 1: Full Gmail Migration with Organization
+### Example 1: Host Europe to Securehost.de with Organization
 ```bash
 # .env configuration
-SOURCE_EMAIL=old@gmail.com
+SOURCE_IMAP_SERVER=wp987654.mail.server-he.de
-DEST_EMAIL=new@gmail.com
+SOURCE_EMAIL=old@company.de
-IMPORT_FOLDER_NAME=OldAccount
+SOURCE_USERNAME=company_mail
-EXCLUDE_FOLDERS=Trash,Spam
+DEST_IMAP_SERVER=mail.securehost.de
+DEST_EMAIL=new@company.de
+IMPORT_FOLDER_NAME=HostEurope_Backup
 
 # Run migration
 python3 email_migration.py
@@ -169,6 +214,8 @@ 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'
@@ -188,14 +235,23 @@ Errors encountered: 0
 ### Common Issues
 
 **Authentication Failed**
-- Use app passwords instead of regular passwords
+- Check if username is required (try both with and without `SOURCE_USERNAME`)
+- 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
-- Check server settings and ports
 
 **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 leaving `SOURCE_USERNAME` empty to use email login
+- 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
@@ -207,20 +263,39 @@ Errors encountered: 0
 - 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 instead of account passwords
+- 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
 
@@ -234,6 +309,15 @@ email_migration/
 └── 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.

email_migration.py

@@ -30,10 +30,11 @@ def setup_logging(log_level):
     return logging.getLogger(__name__)
 
 class IMAPConnection:
-    def __init__(self, server, port, email_addr, password, use_ssl=True, timeout=60):
+    def __init__(self, server, port, email_addr, username, password, use_ssl=True, timeout=60):
         self.server = server
         self.port = port
         self.email = email_addr
+        self.username = username
         self.password = password
         self.use_ssl = use_ssl
         self.timeout = timeout
@@ -49,8 +50,34 @@ class IMAPConnection:
                 self.connection = imaplib.IMAP4(self.server, self.port)
 
             self.connection.sock.settimeout(self.timeout)
+
+            # Try authentication with username first (if provided), then fall back to email
+            login_success = False
+            login_user = None
+
+            if self.username and self.username.strip():
+                try:
+                    self.connection.login(self.username, self.password)
+                    login_user = self.username
+                    login_success = True
+                    self.logger.info(f"Connected to {self.server} using username: {self.username}")
+                except Exception as username_error:
+                    self.logger.debug(f"Username login failed for {self.username}: {username_error}")
+
+            # If username login failed or no username provided, try email
+            if not login_success:
+                try:
                     self.connection.login(self.email, self.password)
-            self.logger.info(f"Connected to {self.server} as {self.email}")
+                    login_user = self.email
+                    login_success = True
+                    self.logger.info(f"Connected to {self.server} using email: {self.email}")
+                except Exception as email_error:
+                    self.logger.error(f"Email login failed for {self.email}: {email_error}")
+
+            if not login_success:
+                self.logger.error(f"Failed to authenticate with {self.server} using both username and email")
+                return False
+
             return True
         except Exception as e:
             self.logger.error(f"Failed to connect to {self.server}: {e}")
@@ -144,7 +171,10 @@ class EmailMigrator:
         if not self.import_folder_name:
             self.import_folder_name = None
 
-        self.logger.info(f"Import folder configuration: {'All emails will be imported to subfolders within \"' + self.import_folder_name + '\"' if self.import_folder_name else 'All emails will be imported directly to INBOX'}")
+        if self.import_folder_name:
+            self.logger.info(f"Import folder configuration: All emails will be imported to subfolders within \"{self.import_folder_name}\"")
+        else:
+            self.logger.info("Import folder configuration: All emails will be imported directly to INBOX")
 
         include_str = config.get('INCLUDE_FOLDERS', '')
         exclude_str = config.get('EXCLUDE_FOLDERS', '')
@@ -158,6 +188,7 @@ class EmailMigrator:
             config['SOURCE_IMAP_SERVER'],
             int(config['SOURCE_IMAP_PORT']),
             config['SOURCE_EMAIL'],
+            config.get('SOURCE_USERNAME', ''),
             config['SOURCE_PASSWORD'],
             config.get('SOURCE_IMAP_USE_SSL', 'True').lower() == 'true',
             timeout
@@ -167,6 +198,7 @@ class EmailMigrator:
             config['DEST_IMAP_SERVER'],
             int(config['DEST_IMAP_PORT']),
             config['DEST_EMAIL'],
+            config.get('DEST_USERNAME', ''),
             config['DEST_PASSWORD'],
             config.get('DEST_IMAP_USE_SSL', 'True').lower() == 'true',
             timeout