If both parties agree, usually at the application or lease stage, that it is convenient to pay by post-dated cheque, then the law allows this method of payment. Landlords cannot force this as a method of payment, and if the tenant changes their mind, then the payment method reverts to cash or regular cheques.
Electronic payment by e-transfer is very common these days, but the law does not make specific mention of this payment method. Once again, the tenant would have to agree to this way of paying.