like cnbuff410 said : You don't have to change your OS for Ubuntu if your only problem is spam. But a switch to linux is mostly always a good option :)
If you want, Just open a google account (if you don't have one) and redirect everything via pop3 or by any other way to your gmail address to centralize everything. You will have all their anti-spam solution working for you ;) You can then sync all your device with the new address and use gmail for iOS on your IPhone.
If you want, Just open a google account (if you don't have one) and redirect everything via pop3 or by any other way to your gmail address to centralize everything. You will have all their anti-spam solution working for you ;) You can then sync all your device with the new address and use gmail for iOS on your IPhone.