Client editable HTML e-mail

Hi, I am looking to create an editable e-mail attachment that can be embedded and amended by the client. I think the term is 'HTML e-mail' which would contain such things as text, images, links (to e-mail and/or social networking sites), my friend 'the client' is looking to send a weekly e-mail which contains updated events, club nights. As it stands there will be a 4-5 images, text wrapping round them, links to social network sites and links within the body text - all of this needs to be easily updatable by the client. I am looking for the best solution so please can you advise how the client would amend the document once you have created the structure. I have attached a copy of something similar to what is required. Many thanks