As there is no absolute definition of what is considered spam, SingNet's Anti-spam service may not be able to filter off 100% of all spam mails, but it should be able to filter out the most common forms of it.
That is not possible. SingNet Anti-spam VAS can only filter out mails from your SingNet email account.
$2.14 per month (including GST).
Your Mass Mail folder, along with any emails in it, would be deleted.
You can call 1688 to terminate the service.