1. You should understand your responsibilities and what kind of use may constitute abuse of the service.
2. The data of computers and personnel shouldn't be put at risk.
3.You know the NHsmail service is provided to aid the provision of health and social care which should be the main use of it.
4. If you are a member of clinical staff you may use the NHSmail service to treat your private patients with your own professional codes of conduct.
5.All data in the NHSmail will be the property of it.
When use the NHSmail service you may have some responsibilities
You mustn't violate the law or regulations of the United Kingdom or any other country. Thay is to say you should be legal to use it.
Here are some occasions that you shouldn't use the NHSmail:
1) You mustn't use the NHSmail for commercial gain like unsolicited marketing, advertising and selling goods or services.
2) You must not attempt to interfere with the technical components, both hardware and software, of the NHSmail system in any way.
3)You mustn't use the NHSmail service when you haven't identified yourself honestly, accurately and completely.
If you want the detailed information please look it up at http://www.nhs.net.

I have told the benefits using NHSmail and now I will make a complement on NHSmail. Definitely what I am talking about is also from the Internet, books and other channels.
You may know:
Using NHSmail to limite the spread of infection in Liverpool.
NHS Sheffield makes the switch to NHSmail.
Lewisham trusts in NHSmail.
Weston Area Health NHS Trust migrates to NHSmail.
The contents above are organisation case studies of NHSmail.
You may also know:
NHSmail helps send automatic alerts when patients are admitted to hospital.
How Leeds and York Partnership NHS Foundation Trust is managing NHSmail leavers and joiners .
NHSmail enables cross-boundary working in London.
NHSmail helps Independent Midwives deliver better maternity care.
These are on case studies of NHSmail.

It is believed that nearly all people know something on NHSmail and it shows most of people choose to use NHSmail/www.nhs.net without consideration.Someone may be curious why use NHSmail rather than other email services. Here I will disclose the secret for the confused people.
1) NHSmail is a service which can make you feel safe for trans-missing some data like patient data, "restricted" status accredited by the government. No other email service can compare the safety with NHSmail.
2) NHSmail/www.nhs.net is a resilient service with two data centers which can be exchanged to work.
3) NHSmail is available everywhere over NHS N3 network and the internet.
4) NHSmail is a service that makes you can call someone for the whole day.
5) No matter to send a email or a SMS, for NHSmail which is free to use as there is no charge to you or to your organisation.
6) NHSmail has a function to manage your email,calender and personal contacts.
The contents above are very detailed which will help you to understand it.