Modern smartphone users often face an unpleasant situation: free space on the device runs out faster than expected. One of the common reasons for this phenomenon is applications of mail services, and in particular, clients from Mail.ru. When first launched, they seem light and fast, but after several months of active use they can grow to several gigabytes, taking up a significant part of the internal memory. This causes system slowdown, problems with installing new apps and constant notifications about a lack of resources.
The main reason for this “bloat” lies in the mechanism of work of email clients that strive to provide instant access to information. Data aggregation occurs not only due to the text of letters, but also due to the automatic loading of attachments, images and interface elements. The user may not notice how every day the application saves photo thumbnails from emails, company logos, signature files and web page display cache. Collectively, these small elements turn into huge amounts of data, which by default are rarely deleted automatically.
In this article we will take a detailed look at the technical aspects of storing data in an application Mail.ru for Android, we'll explain the difference between cache and user data, and offer step-by-step guide for safe optimization. You'll learn what settings you should change to prevent memory overflow in the future, and how to properly clean out accumulated junk without losing important emails or account settings. Understanding these processes will help you keep your smartphone in perfect condition.
Data accumulation mechanism and the role of the cache
To understand why the application takes up so much space, you need to understand the data storage architecture on Android. Any application, including email clients, divides information into two main categories: user data and cache. Application cache - these are temporary files that are created to speed up the app. For example, when you open an email with a picture, the image is saved in local storage so that when you open it again, it will download instantly, without using up Internet traffic.
The problem is that email services often do not have strict limits on the size of this cache or set them too high by default. If you receive dozens of emails a day with graphics, HTML layout and logos, your thumbnail database grows exponentially. In addition, modern versions of applications Mail.ru actively use pre-loading technologies, downloading the contents of letters even before you open your inbox, which also increases the occupied space.
It is important to note that the cache can contain not only pictures, but also temporary attachment files that you have ever opened. Even if you delete an email from your Inbox, a copy of it may remain in the cache until it is manually cleared or the allocated buffer overflows. This creates the illusion that the application is “eating” memory on its own, when in fact it is simply performing its function of speeding up access to data, but doing it too aggressively.
⚠️ Attention: Clearing the cache through the Android settings is safe and does not delete your accounts or emails on the server. However, clearing "App Data" will reset the app completely, and you will have to re-enter passwords and set up notifications.
The accumulation of temporary files is a normal situation, but its extent depends on usage scenarios. If you actively work with email on your phone, view heavy presentations, or exchange photos, the amount of space you occupy will grow faster. Understanding this mechanism allows you to intelligently approach device maintenance without deleting the application completely, but only regulating its appetites.
Enable the “Download images only via Wi-Fi” option in the mail application settings, if available, so as not to clog up the memory with mobile data and cache while roaming.
Automatic downloading of attachments and multimedia
One of the main reasons why the mailer is growing in size is the policy of automatically downloading content. By default, many settings are focused on convenience rather than saving space. The app can automatically download all attached files of a certain type (such as PDF documents or JPEG images), even if you haven't opened them yet. This creates a situation where gigabytes of information are stored on the disk that you may not even have seen.
Particular attention should be paid to multimedia files. Photos and videos sent by mail take up significantly more space than text. If your work correspondence often includes scans of documents or photo reports, the application saves local copies of them. Over time, the media cache folder can become the heaviest part of the application. Automatic saving useful for offline access, but without control it quickly eats up free space.
- 📸 Image previews: Generating thumbnails for each letter with graphics creates hundreds of small files that add up to a significant volume.
- 📎 Attachments: Files opened at least once often remain in the device memory for quick re-access.
- 📧 HTML emails: Advertising mailings and news contain heavy layout, logos and tracking pixels, which also are cached.
To minimize this effect, it is recommended to periodically check your synchronization settings. Some versions of clients allow you to limit the synchronization period (for example, store emails only for the last 30 days) or prohibit downloading attachments larger than a certain size. Ignoring these settings results in the application turning into a local mirror of your mailbox, sometimes taking up more space than the operating system itself.
Functional features and hidden processes
A modern application Mail.ru is not just an email client, but an entire ecosystem hub. Cloud storage, disk, calendar, tasks and even social network elements can be integrated within one package. Each of these functions requires its own space to operate. For example, if cloud synchronization is activated, the application can cache a list of files from Drive, their previews and metadata, which also contributes to the overall weight of the app.
In addition, background processes should be taken into account. To provide instant push notifications, the application keeps certain services active that can create log files. Logging is the process of recording application actions that developers need to debug errors. In normal mode, these files should be small, but in the event of a app failure or “glitch,” the size of the logs can grow uncontrollably, taking up megabytes of useless text.
| Application component | What it stores | Impact on memory |
|---|---|---|
| Image cache | Thumbnails, avatars, logos | High (main consumer) |
| Letter database | Letter texts, headers, dates | Average (depends on the number of letters) |
| Attachments | Documents, photos, archives | Critical (if auto-sync is enabled) |
| Logs and reports | Technical information about errors | Low (usually), but can increase during failures |
Another factor is integration with other company services. If you use a single account, the application can pull up data about contacts, events from the calendar and statuses from instant messengers. All this data requires local storage for performance. Therefore, when you see that an application weighs 2 GB, remember that this is the sum of the work of all its internal modules, and not just the mailbox.
⚠️ Attention: Settings interfaces and menu item names may differ depending on the version of Android and the manufacturer’s shell (MIUI, OneUI, ColorOS). Always check the current menu view in your device.
Diagnostics: how to find out what exactly is taking up space
Before you start cleaning, you need to carry out proper diagnostics. Android provides built-in storage analysis tools, but users often neglect them, relying on third-party cleaners that may be less accurate. To see the real picture, you need to go to the system settings. The path usually looks like this: Settings → Applications → All applications. Find it in the list Mail.ru (or “Mail.ru Mail”) and click on it.
In the menu that opens you will see the “Memory” or “Storage” section. There will be a diagram divided into two parts: “Application Data” and “Cache”. If the cache takes up the bulk of it, this is a good sign, it means your emails are safe and you can safely clean them. If the “Data” section is bloated, this may mean that the application stores a lot of attachments locally or that a large amount of text information has accumulated in its database over the years of use.
- 🔍 Size analysis: Pay attention to the total size figure. If it exceeds 1-2 GB during standard use, intervention is required.
- 📂 Checking folders: Use a built-in file manager (such as Google Files) to find a folder
Android/data/com.mailru.mailand estimate the size of subdirectories. - 📉 Growth dynamics: Watch how quickly the size grows after cleaning. If within an hour the application has again gained 500 MB, the synchronization process may be stuck.
It is also worth checking whether the “Offline access” function is enabled for specific folders or attachments. Some email clients have the ability to mark messages to work without the Internet. Such files are stored separately and do not always end up in the standard cache, increasing the user data section. Disabling this feature for old emails will help free up space.
Hidden system files
In some cases, an application may create temporary files in the phone's general memory, outside its sandbox folder. Look for folders with names like .mailru or temp in the root of the internal memory, but delete them only if you are sure of their origin.
Effective methods of cleaning and optimization
There are several proven methods for freeing up space, from safe to radical. The easiest and most recommended method is to clear the cache regularly through the Android settings. This will not affect your logins, passwords, or notification settings. To do this, in the application menu (section “Memory”) you need to press the button Clear cache. The system will automatically delete temporary files, and the application will start again, creating a cache from scratch.
If clearing the cache did not help or the “Data” section takes up too much space, you can try a deeper method - reinstalling the application. When you uninstall a app through the standard Android interface (Delete), absolutely all data is erased, including accumulated garbage, logs and local databases. After re-installing from Google Play or AppGallery you will receive a “clean” application. You will need to re-enter your password, but this will ensure that any hidden files that may have accumulated over the years are removed.
☑️ Complete cleaning checklist
For advanced users, it is possible to use ADB commands for more detailed cleaning, but this requires connecting to a computer. For the average user, it is enough to know that regular manual clearing of the cache once a month helps keep the application size within reasonable limits. Also, do not forget to check the “Downloads” folder in the file manager - often files from mail are saved there, and not in the application cache, and take up space as separate objects.
It is also important to reconsider your usage habits. Try not to open suspicious emails with heavy attachments unless absolutely necessary. Regularly delete emails from your Spam and Trash folders, as some clients sync their contents as well. An integrated approach that combines technical settings and usage hygiene will give the best result.
⚠️ Attention: Before performing the “Clear data” action, make sure that you remember your mailbox password and phone number to restore access, since the application will completely “forget” your account.
Prevention of memory overflow in future
To prevent the situation with lack of space from repeating itself, it is important to implement preventive measures. First, stay tuned for app updates. Developers often optimize code and improve cache handling algorithms in new versions. Using an outdated version Mail.ru may lead to inefficient use of resources and data accumulation bugs. Enable automatic app updates in your store settings.
Second, configure your synchronization settings. If you have multiple mailboxes, try turning off synchronization for less important ones or increasing the mail checking interval. Instead of “Push” (instant delivery), you can set the interval to 15 or 30 minutes. This will reduce the load not only on the battery, but also on the constant recording of data in the device memory.
Regular maintenance and correct synchronization settings are more important than periodic “spring cleaning”, as they prevent a problem before it occurs.
It is also worth considering the use of “cloud” solutions. If your phone supports working with profiles or has the function of expanding memory through the cloud, some of the data can be transferred there. However, for mail applications, the main advice remains control over attachments: download files only when they are really needed to work on the phone, and immediately after use, delete them from local storage if they are not required constantly.
Frequently asked questions (FAQ)
Is it safe to completely delete the Mail.ru application data folder through a file manager?
No, it is not recommended to do this manually through the file manager, as you can break the file structure or delete system configs, which will lead to the application not working correctly. It is better to use the standard “Clear data” function in Android settings or completely uninstall and reinstall the application.
Why does the application size grow quickly again after clearing the cache?
This is normal behavior. The cache is recreated as soon as you open the application and view emails. If the growth is very fast (hundreds of megabytes in minutes), it is possible that a large volume of emails with attachments is being synchronized in the background or the application itself is malfunctioning.
Will the correspondence be deleted if I clear the cache?
No, clearing the cache affects only temporary files (pictures, thumbnails). All your correspondence is stored on the Mail.ru server and will be downloaded again when you connect to the Internet. However, if you used the Offline Access mode for specific emails, after clearing the cache, you will need to open them again if there is a network.
Is it possible to move the Mail.ru application to an SD card to free up space?
In modern versions of Android (starting from 6.0 and higher), the ability to transfer applications to an SD card is limited or absent for reasons of security and system stability. Most email clients do not support working from an external drive, so this method will most likely not be available.