To the extent a power of attorney expressly grants an agent authority over the content of electronic communications sent or received by the principal and unless directed otherwise by the principal or the court, a custodian shall disclose to the agent the content if the agent gives to the custodian:
(1) A written request for disclosure which is in physical or electronic form;
(2) An original or copy of the power of attorney expressly granting the agent authority over the content of electronic communications of the principal;
(3) A certification by the agent, under penalty of perjury, that the power of attorney is in effect; and
(4) If requested by the custodian:
(a) A number, username, address, or other unique subscriber or account identifier assigned by the custodian to identify the principal’s account; or
(b) Evidence linking the account to the principal.