I am getting sales from email but why?

[HubertCheung]

Hi! I am running Facebook ads and google ads for my store, and the Facebook ads are working well now, though I don't get the purchases right from the ads, I know the ads are responsible for the purchases. Anyway, I've noticed that there are sales coming from email ads as it is shown on Shopify and I actually asked the customers, now that interests me since I am not running ads on emails (no results were registered on ads), not even sending out EDM. Does it also happen to you? I just wanted to figure out who is responsible for these purchases from emails.