Separate address books so you don't accidentally send an email from the wrong domain
I have two companies I’m working for and often when I’m writing a new email, it is being sent from the wrong domain and i accidentally send emails meant for coworkers at one domain from the domain of a different company. It’s dangerous. I'd like to separate address books so when I’m writing an email from domain X, it doesn’t pull up the addresses associated with domain Y. In a hurry I'll make the mistake and the damage is done.