how to disable junk filter on exhcange 2013

hi all,

we recently migrated a few mailboxes from ex2010 to ex2013, since then some mails in the newly migrated boxes start receiving valid mails to their junk folder.

in 2010 we completely disabled the junk filters and denied users from accessing the junk menu in outlook 2010 through gpo.

ive ran the command:

Set-MalwareFilteringServer <Server_Name> -BypassFiltering $True

on both my server (i have DAG), my first question - do i need to restart any service in order to apply the changes?
if not, how can i disable the junk filter entirely? (we have a different system for that)

thanks for the time and help,

Sean