Questions

There are many ways of dealing with spam - the choice is yours - as long as you do!
Please do not go dumping your spam on the NetCells server - that's not nice :-(
Spam eats up disk space, and, when you reach the limit your email will stop functioning altogether!

It is best to deal with spam as it comes, it will mostly end up in your spam folder, unfortunately, that has to be checked on regular basis, spam deleted and not-spam moved to Inbox.

You will find tools in your cPanel > Email:
Email Accounts
Forwarders
Email Routing
Autoresponders
Default Address
Mailing Lists
Track Delivery
Global Email Filters
Email Filters
Email Deliverability
Address Importer
Spam Filters
Encryption
Email Disk Usage

It is essential to stop coming email if an account is no longer used:
- Email > Accounts > Manage > Restrictions (Receiving|Sending|Logging)