Attaching a company to a time zone

We work with a number of different companies, all of whom are in different time zones.  Whenever a new employee from one of those companies sends us an email, we have to go in and set their time zone individually.  FreshDesk is pretty good at figuring out which company they are with based on email address, it would be fantastic if there was a way to associate a time zone with a company, so that we wouldn't have to go in and individually change it with each email from a new address, it would automatically be set based on their company.