I have an e-mail problem at Craft Commerce. Emails are not sent at the time of purchase. The e-mail is only sent when you log in to the backend.
I first thought it was a server queue problem. But the support of our Nginx server could not find any error. I have also already tried out various e-mail sending options. Strangely enough, contact form e-mails are sent immediately and without delay.
The problem occurred first when updating Craft Commerce.