Why did customer not receive the order confirmation email or the shipping update email?

If the customer does not receive the relevant confirmation email, you can ask the customer to check it in the advertising email or spam, and the email may be blocked by the mailbox. In order to better avoid this situation, it is recommended to try to enable the advanced mail feature. For more details, please refer to https://helpcenter.Shoplazza.com/hc/en-us/articles/4408767907993-How-do-I-set-up-advanced-mail-features-