Permission to receive electronic copy

I am in the process of evicting a tenant.

Is there anywhere in the tenant’s contract / agreement with OpenRent, that they agree to receive documents electronically?
My tenant was sent electronic copy of How to Rent at the time she was sent a contract.
I also emailed her a copy before serving Section 21.

Only now, 2 months after serving the notice, is the solicitor asking me if i got permission to send an electronic copy.

Any thoughts gratefully received.