What is causing vendors to receive emails when receiving a purchase order and how can it be turned off?

Problem

Vendors receive emails when a PO is marked as Sent to Vendor instead of Sent.

Solution

Selecting the Mark as Sent option correctly is crucial to avoid sending unintended emails to vendors.

Mark purchase order as sent

1. Go to the PO you are receiving.

2. From the Send As dropdown, select Mark as Sent.

This stops emails from going to the vendor.