Configuring a Red 'Emergency' Label for Emails from email@example.com:
NOTE: The labels feature is not used in the Gmail mobile app. Every message from the firstname.lastname@example.org address has its subject line prepended with [EMERGENCY], so that's the best we can do for the mobile app at this time.
Create a New Label
- Go to Gmail, click on the Gear icon (⚙️) in the upper right corner, then select See all settings.
- Navigate to the Labels tab.
- Click on Create new label.
- Enter the name Emergency for the label and click Create.
Color the Label
- Back in your Gmail inbox, locate the Emergency label on the left sidebar.
- Hover over the label, click the three dots (⋮) next to it.
- Select Label color, choose red, and confirm by clicking Save.
Create a Filter
- Access settings again by clicking on the Gear icon (⚙️), then See all settings.
- Head over to the Filters and Blocked Addresses tab.
- Click on Create a new filter.
- In the "Has the words" field, type
- Click on Create filter.
Apply the Label
- On the next screen, tick the checkbox for Apply the label.
- Select the Emergency label from the dropdown menu.
- Optionally, to label past emails, check the box next to Also apply filter to matching conversations.
- Click on Create filter to finalize.
Now, emails from the specified mailing list address will automatically receive the red Emergency label.