# The Postal Administration Rules 2013, Rule 163: Authentication

Extent: E+W

(1) A document or information given, delivered or sent in hard copy form is sufficiently authenticated if it is signed by the person sending or supplying it.
(2) A document or information given, delivered or sent in electronic form is sufficiently authenticated—
(a) if the identity of the sender is confirmed in a manner specified by the recipient, or
(b) where no such manner has been specified by the recipient, if the communication contains or is accompanied by a statement of the identity of the sender and the recipient has no reason to doubt the truth of that statement.

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Source: https://www.legislation.gov.uk/uksi/2013/3208/rule/163 (the official version)
Page: https://openlegislation.uk/postal-administration-rules-2013/rule-163
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.