New Hampshire's Disclosure of Agency Relationships
From the New Hampshire Real Estate Commission - "Important Consumer Advisory": Even though real estate professionals must always present properties honestly and accurately under the law, you must specifically hire an agent - using a written hiring contract - before that person legally owes you a duty of loyalty. Otherwise, that agent may ultimately be hired by a seller, and have a legal duty to disclose to that seller any information that you have revealed.
Until any agent actually contracts to represent your interests in a real estate transaction, do not disclose any information to him/her that you would not want a seller to possibly know. Visit the commission's full site further down this page.
Nothing in email or other online correspondence shall be deemed to create a binding contract to purchase/sell real estate. No agent has the authority to bind a buyer or seller to a contract via any communications including, but not limited to, email. Binding contracts can only be created with signatures by all parties to an agreement.