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Office 365 for mail....
Cisco ASA or Sophod firewalls...
Microsoft DHCP
email - enterprise level - Exchange or O365 cloud
Firewall (NG) a lot of choises, on my opinion good option is to use Fortigate or Cisco with Firepower module. Palo Alto also on of the leaders in this area.
DHCP - in case of domain environment - best option is to use windows server with DHCP role installed. In this case you have much more possibilities for correct functioning of DNS+DHCP+NAP, and if necessary can easily implement several scenarios of failover for this important role.
Router or Firewall should use Windows DHCP as a helper
The linux platform suits the ideals for many email servers/firewall and dhcp since linux has all the packages needed.
The CentOS or Redhat Enterprise Linux platforms are the preferred one for specified services.
Red hat lixum or fedora platforms