Serving a Section 13 by Email?

The guide on section 13 notices to increase rent says about delivering by hand with a further copy by post with proof of posting. We use the tenancy agreement from the Guild that says the tenant and landlord agree to the serving of documents by email, can this be done? Is the article I read just out of date in that one respect, or must I send it by post?

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Changing the Rent

Learn the rent review process in assured shorthold tenancies. We cover rent review clauses, tenant agreements, and Housing Act 1988, Section 13.