The company can record phonecalls with customers as long as the customers agree, which is already being done under the disguise of "improving customer service". The company cannot record all phone calls an employee makes.
The company can simply require all customer communication to go through a proper CRM. This way there is no need to look into an employee's personal inbox.
The company can simply require all customer communication to go through a proper CRM. This way there is no need to look into an employee's personal inbox.