From In-Portal User Manual

An email notification has the following fields:

• Subject - this field contains the subject of the email notification.
• Send Email As - This flag designates the email to be either in Plain Text or in the HTML format. Some older email clients cannot display the HTML emails, although they can be formatted a lot better.
• Extra Mail Headers � this field contains additional email headers that you may want to add to the outgoing email notification. The mail headers need to be entered in exact accordance with the email regulations.
• Message -this field contains the body of the message. It is possible, and in many cases recommended, to use In-tags in side the email subject and body. The In-tags will allow you to create customized emails. For example, to create an email notification that will address the user by their first and last names, you would use the following In-tags: 'Dear <inp:touser _Field="FirstName" /> <inp:touser _Field="LastName" /> '.

The other columns in the list display the information about the event itself, which cannot be changed from the Regional settings section. To change the event properties, please go to the appropriate Events section, for example, Structure & Data -> Email Setting for In-portal platform category events.