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Guide: Maildir File & Differences Between Maildir and Maildir ++

Many email clients do store files in an offline format on a local Windows PC so that users can access them without having access to the Internet. Today, it is popular among various email applications. This article also describes one format stored in email clients, known as the Maildir file format. Maildir files store a variety of email information. I know that many of you do not know this file format.

Therefore, this article describes the format of the Maildir file. Also, get the Free Maildir Viewer Tool to open Maildir or Maildir ++ files.

Free Download Maildir Viewer Software    Purchase Maildir to Outlook Converter Tool

Difference Between Maildir and Maildir ++ Files

Essentially, it is a file format used to store email messages in a systematic format. Created by the Qmail email client, but it is very common today. Even Mozilla Thunderbird uses this file format. Each time a user receives a message, another file is created with a unique name in Maildir format.

Maildir ++ is an extension of files for Maildir files that support email sub-folders and quotas. All subdirectories of Maildir ++ (dot) are nominated. You can get a better understanding of the image below.

Maildir File Directory Structure

Do you need to understand what a Maildir file is? Here, the file structure of the Maildir file is explained. All email folders are categorized in directory format. The key ones are listed below:

A pictorial representation of how a directory comes before you can help you to understand it better. See image below:

Maildir File Structure

You can see an image of how the Maildir file will be displayed in front of you. But I’m sure you can’t understand the code. Let’s see what the code shows.

Maildir File Format Advantages

Maildir Files Compatibility


There are hundreds of email client requests with different types of storage formats. It is almost impossible to make them aware of everyone. Perhaps you are not familiar with all of them, but at least you know what Maildir file format is. So I hope this article will help you to update your technical vocabulary. You must understand the internal operations and the overall structure of the Maildir file.