90% of attacks start with a phish. It’s critical that IT admins and MSSPs have the right security in place to protect their end users from these phishing attacks. Check out our latest feature brief for tips and tricks to keep your employees off a hackers line!
I'd set it up this way:
xyz.com. NS ns1.nameserver.com.
xyz.com. NS ns2.nameserver.com.
xyz.com. A IP.WHERE.YOUR.DOMAINIS
mail.xyz.com. A IP.WHERE.YOUR.DOMAINIS
www.xyz.com. CNAME xyz.com.
mysub.xyz.com. CNAME xyz.com.
xyz.com. MX 10 mail.xyz.com.
IP.WHERE.YOUR.DOMAINIS/24 PTR xyz.com.
This way, if you ever need to update your IP you only have to change it a couple of times.
this IP.WHERE.YOUR.DOMAINIS obviously needs to be the IP where your domain is.