Is it a scam of some kind?

It says after installation:
Your box’s reverse DNS is currently srv2.proclanservers.com, but it should be [my email]
Is it snooping my emails? I have no idea what srv2.proclanservers.com and I’ve never set it up!
I need some help getting rid of and some explanations!

It’s the reverse DNS name of the IP provided by your hosting company.
So probably you use this hoster? http://www.proclanservers.com/ no?

It’s nothing to be afraid off, ask your hoster if they can change your reverse DNS to your own domain, they can probably help you.