MCP server bundled into CoolUtils Mail Viewer — a 15-year-old Windows tool for opening exotic email formats. Run MailViewer.exe --mcp and Claude can converteml/.msg/.p7m/.mim/.tnef/.olk15/.vcf (+5 more) to PDF/DOCX/HTML/TXT/TIFF with full rendering, pull sender/subject/headers/attachments as JSON, and bulk-extract attachments from folders. Fully local — mail never leaves your machine. Built for DFIR, eDiscovery, paralegal, and IT-admin workflows on Outlook archives and S/MIME-signed mail.

Hi everyone! I'm the maker of CoolUtils Mail Viewer — a 15-year-old Windows app that opens exotic email formats (.msg, .p7m S/MIME, .tnef, .olk15, .vcf and more) that nothing else handles well. We've just bundled an MCP server inside the same binary, so Claude Desktop / Code / Cursor / Cline can call it directly: convert any email file to PDF/DOCX/HTML preserving inline images and headers, pull metadata as JSON, or bulk-extract attachments. Everything runs locally — mail never leaves your machine, no SMTP/IMAP/Graph involved. Built for the people doing this work the hardest way: paralegals reviewing case correspondence, DFIR analysts triaging Outlook archives, IT admins migrating mailboxes. Now you can describe what you need in plain English and let the agent figure out the parameters. Repo with README + Claude config snippets: https://github.com/AlexBuzaev75/... — happy to answer questions about the MCP implementation or format edge cases!

I love that everything runs locally too, especially for legal and security workflows where privacy matters a lot. The MCP integration is a good feature.

CoolUtils Mail Viewer MCP

Let Claude read .msg/.eml/.p7m and convert them to PDF

Let Claude read .msg/.eml/.p7m and convert them to PDF