newbies cannot message other members, they are restricted by default but ranks above can make use of this feature and communicates effectively.
Am not sure if buying corper membership rank could help evade this
Newbies can message other members. But by default, newbies can not be able to message other members unless 'allow message from newbies, is checked, that can be done on Personal Message Option that you can see at the left side after you clicked on your profile.