android-client

Secure email android app that uses end-to-end encryption and respects users privacy.

Debugging

Here are 3 safe methods to extract APK files for analysis:

1. APK Downloader Services

• Use trusted sites like APKPure or APKMirror- Search for package name: com.mailum.mailapp
• Verify SHA-256 checksum after download

2. Official Play Store Method

• Install Aurora Store (open-source client)
• Use Google account authentication
• Direct download through Play Store infrastructure

3. ADB Backup Extraction

adb shell pm path com.mailum.mailapp
adb pull /path/to/base.apk

• Requires USB debugging enabled
• Preserves original signature

For reverse engineering:

1. Use Apktool for resource decompilation:

apktool d base.apk

2. Analyze Java code with JADX3. Check native libraries in lib/ folder

Security Recommendations:

• Use virus total
• Use virtual machine for analysis
• Verify signature with:

keytool -printcert -jarfile base.apk

• Check for ProGuard/R8 obfuscation patterns

All methods comply with standard Android development practices and don't require TCP manipulation or root access.

Sources:

• How to extract source code of an apk using apktool
• APK Decompiler: A Comprehensive Guide to Decompiling Android APKs
• Build an APK Extractor Android App using Kotlin