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EMLX

EMLX file format
explained

Apple Mail Message — macOS native email format

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What is a EMLX file?

EMLX is Apple's proprietary email format used by Apple Mail (Mail.app) on macOS and iOS. Each .emlx file contains a single email message with a byte count header followed by RFC 822 content, plus optional Apple-specific metadata in a companion .plist file. EMLX files are stored in macOS Library folders.

Origin

Apple Mail (Mail.app)

Used by

Apple Mail on macOS and iOS

Key features

One file per email message
Apple Mail metadata support
Based on RFC 822 with extensions
Companion .plist metadata files
Native macOS Spotlight indexing

EMLX conversions

Convert from or to EMLX with MailtoPst

Convert EMLX to...

EMLX → EML EMLX → MBOX EMLX → OLM EMLX → MSG EMLX → PST

Convert to EMLX from...

EML → EMLX MBOX → EMLX MSG → EMLX PST → EMLX

EMLX guides & articles

Apple Mail to Outlook: The Complete Migration Guide (2026)

Migrate all your Apple Mail emails to Microsoft Outlook. Convert EMLX or MBOX to PST online. Step-by-step guide for macOS users.

How to Convert EMLX to PST (Apple Mail to Outlook)

Complete guide to converting Apple Mail EMLX files to Outlook PST format. Migrate from Mac to Windows without losing your emails.

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