As many of the stories here, I also used this site for backup/forwarding of some of my important mails. it was going on fine for almost a year and half. during that period my trust on them increased rapidly. It was also a new concept for getting payed while one check mails. click some adverts and u get money. althouth I also got money from them, the quick and sudden disappence from internet was nothing much than robbers running when the heat was on. if they had the guts to admit that their dotcom was going bust and had they requested /told their subscribers to backup and to stop using the mail functionality, then it would be different story. they ran away with tails between their legs.
undoubly they are other dot coms which were going burst and they had a decency to tell that they had gone burst example is https://naradonline.com and others.