Section 30(2)(a) in The Adjudicating Authority (Procedure) Regulations, 2013
(a)If the addressee has designated a computer resource for the purpose of receiving electronic records-(i)Receipt occurs at the time when the electronic, record enters the addressee:(ii)If the electronic record is sent to a computer resource of the addressee that is not the designated computer resource, receipt occurs at the time when the electronic record is retrieved by the addressee: