Get rules list
Get-InboxRule -Mailbox <mailbox name or alias>
Get detail on each rule
Get-InboxRule -Mailbox <mailbox name or alias> -Identity “<rule name>” | Select -Property *
Disable Rule
Disable-Inboxrule -identity “<Rule name>” -mailbox <mailbox name or alias>
Remove Rule
Remove-Inboxrule -identity <Rule Name> -mailbox <mailbox name or alias>