Mail White list and Upgrading

[Kishin]

Hi,

I have 2 questions,

1) In Server > Mail > White list : There is this ip 127.0.0.0/8, and I have a black list ns1.mydomain.com because it is sending spam using [email protected]. Is it ok to remove the 127.0.0.0/8? because I dont know how to stop this email from sending.

2) I have a the key for 8.4.0 if I upgrade to 8.6.0 do I need to upgrade my key (Purchase a new key)?

Thanks,