I have used a number of mail services and I haven’t come across a service that is so simple and painfree to use.
It is provided by novell.
It has the fastest webmail interface I have seen (no graphics)
I have to warn, it is not fancy at all the service offers alternative interface in case you do not like the current plain interface the other interface is more featureful but loads slowly.
Because there are no ads the result is a more professional mail that is offered by other providers.
The only problems faced by me was that the site was down once in a while.
When I complained they offered that the company offers this service only for testing their server software and the site can be and will be down occasionaly.
However that does not occur frequently enoungh to cause problem. Apart from that no problems
It provides POP 3 and does not insert its own ads. Too bad they don’t accept new accounts.