About this utility
How to use Email Header & MIME Inspector
Parse an RFC-style email, summarize routing/authentication headers, and inventory MIME parts without rendering content.
What to provide
Paste headers and optional body. HTML and attachments are counted but never rendered or executed.
- Paste, type, or drag and drop a supported text file into the input area.
- Choose the options that match your intended result.
- Select “Run tool” or press Ctrl/Command + Enter, then copy, download, or move the result back into the first input for another pass.
What the result means
Normalized headers, hop/authentication summary, MIME part inventory, and suspicious-header findings.
Privacy and safety
This utility is loaded as browser code and processes your input only in this tab. OmniCastConverter has no upload endpoint and never stores your content, filenames, tokens, or secrets. Generated markup and code are shown as inert text and are never executed.
Limitations
- This is structural inspection, not spam classification, malware scanning, DKIM cryptographic verification, or DNS-based SPF/DMARC evaluation.
Try the included example
Select “Load example” at any time to restore this tested sample.
From: Ada <ada@example.com>
To: Team <team@example.org>
Subject: Local report
Date: Thu, 23 Jul 2026 12:00:00 +0300
Message-ID: <local@example.com>
Authentication-Results: mx.example.org; dkim=pass; spf=pass; dmarc=pass
Content-Type: text/plain; charset=utf-8
Nothing was uploaded.