What is MIME type "application/vnd.seemail"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

The MIME type application/vnd.seemail identifies files created by a specialized email system.
Files with the SEE extension use this format.
It packages email data, including message content and attachments, in a proprietary structure.

Main use: Enables dedicated email applications to recognize and process these files correctly.
Email Archiving: Supports storage and retrieval of complete message details.
Secure Messaging: May include features to protect message integrity and privacy.
Vendor-Specific Integration: Ensures compatibility across custom mail systems and servers.

This MIME type helps your PC know which application should open the file.
More details can be found at the IANA Media Types Registry.

Associated file extensions

.see

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:


    Content-Type: application/vnd.seemail

HTML

In HTML, you can specify the MIME type in various elements:


    <a href="file.dat" type="application/vnd.seemail">Download file</a>

Server-side (Node.js)

Setting the Content-Type header in Node.js:


    const http = require('http');    
    
    http.createServer((req, res) => {    
      res.setHeader('Content-Type', 'application/vnd.seemail');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.see

FAQs

What application is required to open application/vnd.seemail files?

Files with this MIME type are proprietary and typically require the SeeMail application or specific vendor software designed for this email system. Without the correct client installed, you will likely see an "Unknown file type" error on your PC.

How do I configure an Apache server to serve .see files correctly?

To ensure browsers recognize the file type, add the following line to your .htaccess file or main configuration: AddType application/vnd.seemail .see. This tells the server to send the correct MIME header during file transfer.

Why does my browser download the file instead of displaying the email?

Web browsers like Chrome, Firefox, and Edge do not have built-in rendering engines for proprietary email formats like application/vnd.seemail. Therefore, the browser defaults to downloading the file so it can be opened by a local desktop application.

Are files with the MIME type application/vnd.seemail a security risk?

Since this format packages email content, it can potentially contain malicious attachments or scripts. You should treat these files with the same caution as any email attachment and scan them with antivirus software before opening.

How can I add support for this MIME type in Nginx?

You can add the type to your mime.types file or inside a server block. Use the directive: types { application/vnd.seemail see; } to associate the extension with the MIME type.

Can I convert application/vnd.seemail to a standard PDF or EML file?

Direct conversion usually requires the original SeeMail software to open the file first. Once opened, you can often use a "Print to PDF" feature or export the message to a standard format like .eml. See our guide on EML for more on standard email files.

General FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why are multiple MIME types listed for one extension?

Different applications and historical conventions may use alternative MIME identifiers for the same kind of file. Showing them all helps ensure compatibility across systems.