Never send a cold email using an Email Marketing Automation tool.
You may think you can send a burst of 1000 emails in a single click with tracking enabled but none of them will ever be opened.
Reason: All of them will land up in the “Promotions” tab (if the recipient is using Google Email, most of them would be using that).
Hence always send cold emails manually.
There is a reason why experts recommend you personalize cold emails. So that you can type it manually.