The default mail application of Mac can be changed to Outlook, Spark and other clients. The specific steps are as follows: 1. Open "System Settings" or "System Preferences" and enter the "Default Application" section; 2. Select the target mailbox application in the "Email" column; 3. If the target application is not displayed, check whether it supports mail protocol binding and try to restart the application or update the version; 4. Test whether the change is effective, click the web email link to confirm whether the pop-up application is the target client. Complete the above steps to successfully switch the default mailbox.

The default mail app for Mac is Apple Mail, but if you prefer to use Outlook, Spark or other clients, you can completely replace the default mailbox. This is not difficult, but many users don’t know how to operate it.

Open system settings to adjust the default mailbox

The default mail application for Mac can be changed directly in the system settings. Open System Settings or System Preferences and enter the Default Applications section under Desktop and Screen Saver (different macOS versions may vary slightly). Find the "Email" column and click the drop-down menu to select your commonly used mailbox apps, such as Outlook or Spark.
If you don't see the app you want to choose, it means it has not been registered as an optional email client. You can first open the app to see if you prompt for an associated protocol. For example, after Spark is installed, a prompt will usually pop up automatically to confirm whether it is set to the default.

Check if the third-party email address is registered correctly

Sometimes the mailbox app you want to set as the default one does not appear in the options. At this time, you need to confirm whether this app supports email protocol binding. Most mainstream mail clients (such as Outlook, Thunderbird, Spark) support it, but some lightweight tools may not provide this feature.
If the target mail application has been installed but it still does not appear, you can try the following steps:

• Restart the target mail app, sometimes it will automatically register when it is first run
• Right-click the application in Finder → "Show Package Content" → Check whether there are relevant configurations for registering the email protocol (advanced operation, non-essential)
• Updates to the latest version to ensure compatibility

Verify that it takes effect when clicking on the email link

After the modification, you can simply test whether it really takes effect. Click a mailto: mail link in the browser (such as the "Contact Us" button on the webpage) to see if the pop-up is the email client you want to set as the default one. If not, you may need to manually restart your Mac, or go back to the settings to confirm whether the selection is successful.
Sometimes Safari browsers have cache behavior, and you can also try it with another browser.

Basically these steps. The settings themselves are not complicated, but it is easy to ignore whether the third-party application is really ready to be set to the default. As long as this step is OK, it will be quick to switch.

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