Tao hộp thư gmail app

You're looking for the Gmail app's settings for sending emails with a "Tao" subject line.

Here's how you can do it:

Method 1: Using the Gmail app's built-in feature

1. Open the Gmail app on your device.
2. Tap the three horizontal lines (menu icon) on the top left corner.
3. Tap "Settings" (gear icon).
4. Scroll down to the "General" section.
5. Tap "Signature".
6. Tap the "New" button to create a new signature.
7. Type "Tao" in the signature field.
8. Tap "Save" to save the changes.

From now on, all your outgoing emails will have the subject line "Tao".

Method 2: Using a third-party email client

If you prefer to use a third-party email client, you can also set up a custom subject line using the client's settings. For example, if you're using the Microsoft Outlook app, you can follow these steps:

1. Open the Outlook app.
2. Tap the three horizontal lines (menu icon) on the top left corner.
3. Tap "Settings" (gear icon).
4. Scroll down to the "Compose" section.
5. Tap "Subject line".
6. Type "Tao" in the subject line field.
7. Tap "Save" to save the changes.

This will set the default subject line for all your outgoing emails in the Outlook app.