Originally Supanet.com was pretty good. An uncluttered home page and free web mail service that became my first choice of use. However, for all the same old reasons (money) they decided to charge to retain use of my email addresses. At the time it seemed wise to pay with almost all my contacts familiar with @supanet.com as part of my identity!
Over the last couple of years supanet's service has declined rapidly.
Although the home page is always accessible, it's now so full of adverts you have wait a while for all this crap to load and this often interferes with UI performance & enjoyment - it's like clicking onto a minefield & with the wrong move it can often become messy so you often end up closing your entire browser and clearing your cache before starting over with more caution! This is frustrating if you have other useful webpages open at the time having to search your history etc.
On the email front - be warned! Their web-mail service is too slow & unreliable and with little support. It often goes down leaving you at the log-in page. You can access your account (pointless really) to check you are not going insane with passwords, but at least you can get a list of telephone numbers they answer with a recorded message telling you what you already know - the webmail system is down and they are looking at it. Great, but this message forgets to say - we haven't really got a clue when it will be back on and don't care, that's why this is an recorded message!
That said, I have got through once to find out all my email addresses had been mixed up with another account - great!

In brief, you pay £10 per year for an average product & poor service. I'd rather obtain a free (& reliable) service like my partner has had for over 10 years with no problems. If I can get to speak to someone before my subs are due in 11 month time to cancel, I'll move on...