We use SupportBee and it works pretty well for shared email support. It's a paid product but it's affordable and the pricing isn't based on the number of people

We use SupportBee and it works pretty well for shared email support. It's a paid product but it's affordable and the pricing isn't based on the number of people. https://supportbee.com https://supportbee.com Depending on your business you can probably get away with only answering support requests during business hours.