Adds a user to a list (requested by another user). Verifies the proper authorization and sends acknowledgements unless quiet add has been chosen (which requires the quiet_subscription setting to be “optional”) or forced (which requires the quiet_subscription setting to be “on”).
See also “Attributes” in Sympa::Request.
Mandatory. E-mail of the user to be added.
Optional. If true value is specified, users will be added even if the list is closed.
Optional. Display name of the user to be added.
Optional. Don't notify addition to the user.