Hi Cheryl!
Is this the same multisite set up as before? I’m not sure it matters, but it might be good to know.
Ultimately, I’m not sure this has much to do with our plugin. If the order completes successfully, at that point it is the responsibility of WooCommerce. Otherwise, there are a number of of moving pieces on your server for sending out mail. So that depends a lot on your configuration. (Many times I just for get to start postfix, for example)
I believe this is the screen you want for the email notifications though, in WooCommerce:
/wp-admin/admin.php?page=wc-settings&tab=email§ion=wc_email_new_order

Does this make sense? Let me know if this doesn’t work for you.
Cheers!
– Casey Driscoll