Using shop in dutch translation, so below texts might be slightly different.
Using supplier addon.
Succesful new orders are setup to show up in the webshop with status 'Open'.
Status 'Open' has options 'Notify customer', 'Notify order department' and 'Notifiy supplier' checked.
When customer places order, order gets set to status 'Open' and shows up under orders.
No e-mails appear to get sent: I've checked mail logs and queues on server and nothing shows up there (whereas other mails do).
If I manually change an order to another status and back to status 'Open' and leave all checkboxes checked (notify customer, order department, supplier) all 3 get the mail as expected.
I'm not sure if ahmedatnet has the exact same issue, but looks the same.
As said all other mails appear to work fine.
Just to be sure I've also tried it with smtp instead of php mail function, but the issue remains the same.