Which of the following should the user perform FIRST when trying to resolve this issue?

A user reports trouble with the network connection on a workstation. The user was initially able to receive emails but received an error when trying to send messages. The user is able to authenticate to the domain successfully and can see data in the network shares.

Which of the following should the user perform FIRST when trying to resolve this issue?
A . Update the NIC drivers
B . Assign a static IP address
C . Change the DNS servers.
D . Check the SMTP server.

Answer: D