It is possible to customise the subject and content of email notifications using Amplify's Translations feature. This feature allows you to replace Amplify's labels with your own text.

To add custom text in the email subject line and content:

1. From the upper-right corner, click on your user name or avatar and select Administration from the list of options.
2. Scroll down to select the Translations tab on the left.
3. In the search field on the right-hand side, type in "mailer".
   This will display all standard text strings that are included in various email notification templates that Amplify uses.
   
   
4. Each type of notification is organised into a list of keys and the corresponding text label. You'll see labels for the subject line and various other labels that appear in the email content. 
   
5. Locate the email notification that you want to customize. You can use the sample email templates given earlier in this section to match the text in it with what is given in the Default Translations column.
6. Identify the label you wish to customize, locate it in the Default Translations column, type in your custom text in the Custom Translations column next to it.
7. Click Apply and Restart when done translating all required labels.
   
   To illustrate this, if you want to customize the Welcome email Amplify sends to a new user, compare Amplify's default welcome email content with the text strings listed under different sections in the Default Translations column. This will help you locate which translation keys would require to be customised.
   
   Find the matching group of text labels in the Default Translations column. You can see that the standard text labels under 'welcome_token_email' match the text labels used in the above email.
   
   
   
8. Enter custom values for each text string in the Custom Translations column.
9. Click Apply and Restart to save the configuration changes.
   You'll notice that emails sent to new users created after this has the custom subject and content.