When an email arrives and spamsieve comes to the dock with a number showing, how do I get to the Spamsieve folder to see if its an email I want to read. ie. it may have been mistakenly picked up by spamsieve.
The number in the Dock icon refers to messages that SpamSieve thought were good. So they will be in your inbox, unless you have other rules that move them to a different mailbox.
Spam sieve newbie
How can I make certain it hasn’t collected an email I don’t need then?
I’m not exactly sure what you’re asking. It’s supposed to collect the spam messages that you don’t need. These will be moved to the Spam or Junk mailbox, depending on which e-mail client you’re using.