Filters whether an email address is unsafe.

Filters the minimum site name length required when validating a site signup.

Filters the contents of the email notification sent when the network admin email address is changed.

Filters the text of the email sent when a change of network admin email address is attempted.

Filters the content of the email sent to the Multisite network administrator when a new site is created.

Filters the message body of the new site activation email sent to the network administrator.

Filters the new site name during registration.

Filters the message body of the new user activation email sent to the network administrator.

Filters the amount of storage space used by the current site, in megabytes.

Fires before a user is removed from a site.