When email addresses change, there are several places within a Drupal site where the email may need to be updated.
account
Avoid Security Risks
Your account for maintaining your library’s website includes some limitations on the type of changes you can make to the website. Even with these limits, in the wrong hands, your account could pose a risk to the site. A hacker could use it to launch a cross site scripting (XSS) attack, in which they take control of the site and do whatever they want with it -- take it offline, post inappropriate content, etc.
To avoid security risks, it is important to protect your account by following these rules: