Email Files: EML, MSG & MBOX Structures
MIME message boundaries, email headers, and cross-client migrations.
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Format Comparison & Technical Specifications
| Output Format | MIME Type | Specification | Type |
|---|---|---|---|
| EML RFC 822 Email | message/rfc822 | RFC-5322-EMAIL | Standard Email Message File |
| MSG Outlook | application/vnd.ms-outlook | MS-OXMSG-SPEC | Microsoft Outlook Item |
| MBOX Archive | application/mbox | RFC-5322-EMAIL | Mailbox Concatenation File |
| VCF vCard Contact | text/vcard | RFC-6350-VCARD | Electronic Business Card |
| ICS iCalendar | text/calendar | RFC-5545-ICAL | Calendar & Scheduling Event |
| PDF Printable | application/pdf | ISO-32000-2 | Printable PDF Document |
| HTML Email | text/html | RFC-5322-EMAIL | Hypertext Email Body |
| TXT Email Plain Text | text/plain | RFC-4180-CSV | Extracted Email Text Body |
| CSV Contacts | text/csv | RFC-4180-CSV | Tabular Contact Spreadsheet |
Technical Specifications & Codec Breakdown
EML vs. MSG: The Open Standard vs. Outlook
EML is the RFC 822 open standard used by Apple Mail, Thunderbird, and webmail clients. Microsoft Outlook uses proprietary binary MSG files. Converting MSG to EML unlocks emails so they can be viewed on any platform without Microsoft Office.
Extracting Attachments & Preserving Headers
Email files store sender IP addresses, SPF/DKIM verification signatures, and Base64-encoded attachments. Converting EML to PDF creates a permanent, legally auditable copy with all header timestamps and inline images intact.
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