IDNet are now providing a secure webmail login, https://webmail.idnet.com/, in addition to the 'normal' login at http://webmail.idnet.com/.
This will allow those users who can take advantage of SSL the option to do so, while the 'plain' login will remain available for those whose devices cannot support SSL. There is a link from the unsecured login page to the secure login page to make life even easier.
In addition, customers using idnet.co.uk addresses can access secure webmail at https://mail.idnet.net.uk:9001.