Email Server Static NAT

in Next Generation Firewall , if we want to create Rule to allow Users to access email servers from outside , - it is clear as shown via KB Firepower videos and return traffic is allowed because Next generation firewall is stateful - Clear [ Create NAT Rule and Access Control ]

Now , If we want to allow this email server / email gateway to go out to the internet through firewall with specific IP to get update . should I create Static NAT as well?

I have concept issue in this area.