Importing customers/orders without mails

Hi

Thanks for the help on my previous website. For a new one, I want to import again everything from Shopify. The only thing I noticed last time, was that all my old clients got a mail from their order a long time ago.

I want to prevent that this time because this site has more than 7.500 clients. How can I disable that mails are send?

Thank you!

Kind regards

Stijn