Batch Email Attachment Extractor is a desktop MIME multipart attachment cataloger, deduplicator, and batch unpacker for standalone .eml messages, Unix .mbox archives, and Maildir directories on Linux. A lightweight Linux alternative to desktop email attachment unpacker utilities such as AttachView, it parses RFC 5322 messages locally, decodes internationalized filenames and encoded MIME payloads, and writes clean files directly to disk.

Key Features:

• Multi-Format Email Unpacking: Reads standalone .eml files, multi-message .mbox archives, and Maildir folders (cur/new), decoding RFC 2047 and RFC 2231 filenames alongside Base64 and Quoted-Printable MIME parts.
• Detailed Attachment Catalog: Lists every attachment with decoded filename, extension, MIME content type, transfer encoding, byte size, SHA-256 digest, sender, subject, and UTC message timestamp.
• Flexible Filtering & SHA-256 Deduplication: Filter attachments by filename, sender, file extension, minimum/maximum byte size, or duplicate status, and batch-extract with optional SHA-256 deduplication and sender/date/extension subfolder grouping.
• Live Payload Preview & Manifest Export: Preview raster images, UTF-8 text attachments, or binary hex headers before extraction, and export full CSV or JSON manifests.

Disclaimer: This project is an independent open-source tool and is not affiliated with, sponsored by, or endorsed by NirSoft.