Are bank processing or clearing times for rental payments the responsibility of the landlord or the tenant?

My landlord and I have agreed to use Paypal for my rent payments, as the service is convenient for me (no checks to write) and for my landlord (no waiting to deposit checks at the bank). My lease states that my rent payment is due by the first of the month, but recently my landlord has been asking me to email her the rent no later than two business days before the first of the month, because it takes 2-3 business days for the electronic payment to clear her bank account. From what I understand, if the lease states rent is due on the first, my responsibility is to make sure my payment is delivered to my landlord no later than the first, whether it is a physical check or a Paypal transfer, and that bank clearing times are not my responsibility. Is this assumption correct?