I work in an industry where external emails come in where the senders will typically just throw a bunch of recipients' emails into the TO: and hope they get a response from any one of the parties (so they don't know exactly who would be responsible to reply, they just pick anyone in their contacts). I work in customer support. I received an email from a customer about an order they recently received. Two service people in our company were copied (in the TO:) on the email. I began doing my thing where I investigate outside of the email by contacting someone else here about it before I respond to the customer. One of the service people decided to just do a reply all to include the customer, plus the employee I was already talking to outside the email and decided to handle it himself. It's not his department and not how I go about handling things telling the customer we'll just do something without confirming it with others first. In fact, that other employee I was talking to was headed in one direction with the issue and the service person went in a complete other direction on top of handling it not how I would have. What should I do about this? How can I essentially tell the responding employee to effectively "stay in his lane"? Or should I raise this issue with my boss?
On the customer side, should I be emailing the customers who do this back and tell them to address only me when emailing about their order issues that I am here to handle?
Edit to clarify: Someone answered, "This person was in the TO field, so why shouldn't this be their responsibility or 'lane'"?
As I stated, the customer just emailed anyone here that was in their contacts list. A service technician is not responsible for responding to customer parts order issues. That is why it is not their responsibility to respond. It isn't their department.