In some U.S. states, email exchanges have become binding contracts. In 2016, New York courts ruled that the principles of real estate contracts applied to both electronic communications and electronic signatures as long as “their content and subscription met all the requirements of the current statute” and in accordance with the Electronic Signatures and Records Act (ESRA).   Contracts are governed mainly by state law and general (judicial) law and private law (i.e. the private law agreement). Private law in principle includes contractual conditions between parties exchanging commitments. This private right can put an end to many of the rules that are otherwise set by state law. Legal laws, such as fraud status, may require certain types of contracts to be concluded in writing and executed with particular formalities for the contract to be applicable. Otherwise, the parties can enter into a binding agreement without signing a formal written document. For example, the Virginia Supreme Court at Lucy v. Zehmer said that even an agreement reached on a piece of towel can be considered a valid contract if both parties were reasonable and showed mutual agreement and consideration. Under Australian law, a contract can be cancelled on the basis of unscrupulous transactions.   First, the Claimant must show that he was subject to a particular disability, which is the test of his inability to act in his best interest.
Second, the applicant must prove that the defendant took advantage of that particular disability.   Some treaties are subject to multilateral instruments that oblige an unelected court to dismiss cases and require recognition of judgments rendered by courts on the basis of a jurisdiction clause. For example, the instruments of the Brussels regime (31 European states) and the Hague Agreement on the courts (European Union, Mexico, Montenegro, Singapore), as well as several legal acts relating to a particular area, may require courts to enforce and recognise choice clauses and foreign judgments. Finally, a modern concern, which has increased in contract law, is the increasing use of a particular type of contract known as “membership contracts” or form contracts. This type of contract may be beneficial for some parties, since in one case the strong party has imposed the contractual terms of a weaker party. For example, mortgage contracts, rental agreements, online purchase or signature contracts, etc. .