Guidance for agents, or anyone making cold-contact - please be brief - please say upfront what action you would like from me - please say why I specifically can help you - I like to interact with people who identify as high agency. If this is you, please say so - the correct form of address is "Dear Professor Stafford". I don't really mind, but it shows attention to detail - I don't have the funds for PhD students, so I can't help you there.