how to change the word "localhost" in the url using the server's ip address instead?

when I receive an alert in my email, I see localhost when I point to a url in the email (for example when I want to see the sensor in question or change the notification settings). So my question: how to change the word localhost in the url using the server's ip address instead?

example: https://localhost:843/sensor.htm?id=3274 ----> https://123.123.123.123:843/sensor.htm?id=3274

alerts email-notifications notification-email