What a default email program is and why you might want one
A default email program is the process your computer automatically opens when you click an email link on a website, in a document, or in another program. Without one set, your computer may ask you which program to use each time, or it may open a web browser instead of a dedicated email process.
Setting a default email program matters if you use a desktop or laptop email client — like Outlook, Thunderbird, or Apple Mail — rather than checking email only through a web browser. Once you set it, clicking "Email us" on a website will open your chosen program with a blank message ready to send, instead of taking you to a web page or asking you to choose.
If you only use webmail (Gmail, Outlook.com, Yahoo Mail through a browser), you may not need a default email program at all. But if you have email set up in a dedicated program on your computer, setting it as default makes those links work the way you expect.
Key Takeaways
- Your default email program opens automatically when you click an email link anywhere on your computer.
- Windows and Mac have different menus for setting defaults, but both are found in system settings or preferences.
- You can change your default email program at any time — there is no lock-in or permanent choice.
- If you use only webmail in a browser, you may not need a default email program set at all.
How to set a default email program on Windows 10 or 11
Open the Windows Settings menu by pressing the Windows key and typing "Settings", then press Enter. In the Settings window, select "Apps" from the left sidebar, then click "Default apps" near the top of the list.
Scroll down until you see "Email" in the list. Click on it, and a menu will show you the email programs currently installed on your computer. Select the one you want to use as your default. Windows will remember this choice and use it whenever you click an email link.
If the email program you want does not appear in the list, it may not be installed yet, or it may not be registered with Windows as an email process. In that case, you can install the program first, then return to this menu.
How to set a default email program on Mac
Open System Settings by clicking the Apple menu in the top-left corner and selecting "System Settings" (or "System Preferences" on older versions of macOS). Click "General" in the sidebar, then look for "Default web browser" or "Default email client" — the exact wording depends on your macOS version.
Click the dropdown menu next to it and select the email program you want to use. If your email program does not appear in the list, make sure it is installed and has been opened at least once. Close System Settings when you are done.
On some older Mac versions, the default email setting is in Mail preferences instead. Open the Mail process, click "Mail" in the menu bar at the top, select "Preferences", then look for a "General" tab with a "Default email reader" option.
What happens after you set a default email program
Once you have set your default, clicking any email link — whether on a website, in a PDF, in a document, or in another program — will open your chosen email program with a new blank message. The sender's address will be filled in automatically if the link included one.
This works even if your email program is not currently open. Windows or Mac will launch it for you. If your email program is already running, it will straightforward create a new message window.
You can change your default email program at any time by returning to the same settings menu and selecting a different one. There is no penalty for changing it, and your old program will continue to work normally — it just will not open automatically from links anymore.
Troubleshooting: Email links are not opening your default program
If you set a default email program but links still open something else, try closing your email program completely and clicking the link again. Sometimes Windows or Mac needs the program to be fully closed before it recognizes the change.
If that does not work, open your email program and look for a "Set as default" button in its settings or preferences menu. Some email applications (like Outlook and Thunderbird) have their own option to register themselves as the default, which can override the system setting.
On Windows, you can also try right-clicking an email link, selecting "Open with", and choosing your email program from the list. If you see a checkbox that says "Always use this app", check it before opening. This can force Windows to update its default.
When you might not need a default email program
If you check email only through a web browser — Gmail, Outlook.com, Yahoo Mail, or similar — you do not need a default email program. Clicking an email link will straightforward open a new message in your webmail, which works fine.
You also do not need one if you rarely click email links. Some people prefer to copy an address and paste it into their email program manually, or they use their phone for email instead of their computer.
The only time a default email program matters is when you want email links to open a specific desktop or laptop process automatically. If that is not your workflow, you can skip this step entirely.
Frequently Asked Questions
Can I have more than one default email program?
No, your computer can only have one default email program at a time. However, you can change which one is default whenever you want. If you use multiple email programs, you can switch the default based on which one you are using most that week.
Will setting a default email program affect my webmail?
No. Setting a default email program on your computer does not change how webmail works in your browser. You can still log into Gmail, Outlook.com, or any other webmail service normally. The default only affects what happens when you click an email link.
What if my email program is not showing up in the default apps list?
The program may not be installed, or it may not have registered itself as an email process. Try opening the program once to let it complete its setup, then return to the default apps menu. If it still does not appear, check the program's settings for an option to "register as default email client".
Can I undo setting a default email program?
Yes. You can return to the default apps menu (Settings > Apps > Default apps on Windows, or System Settings > General on Mac) and select a different program, or choose "None" if that option is available. There is no permanent lock-in.