[Air-l] FW: reasonable security with email interviewing research participants

I am a new member to this list and have yet to join AOIR. I would very much appreciate any references/advice/other lists regarding reasonable security measures when conducting email interviews with individuals. I am currently undertaking a PhD in the area of women's health. I am familiar with email conversations regarding 'sensitive' topics as I work as an email nurse-counsellor. I want to set up a system that is highly accessible for participants who have limited computer skills and yet also advise them with regard to protection of the data they provide. The interviews will be conducted one-to-one. Many thanks, Catherine