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 Is the article I read just out of date in that one respect, or must I send it by post?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

Understand the process of reviewing rent in an assured shorthold tenancy with our insights on rent review clauses, tenant agreements, and section 13 of the Housing Act 1988.