>3. Wp Pizza System sends the order mail at 19:16 (nearly an hour later)
that happens if paypal does not send the notification to the server in a timely manner or the server itself does not respond/accept that notification (or perhaps th eemail server “sits on it” for a while)
there’s nothing i can do I’m afraid (paypal DOES sometimes have a delay of this sort, but not too often)

all gateway updates will still work with the old versions of wppizza (essentially the coding for the old versions have stayed the same, but if you are using wppizza 3.x the new coding will be used so to speak)

> It send the order mail at 19:26. And the strange thing is: in the order mail it say : Time of order: 18:20 !

to me that sounds like the email itself is being held in a queue somewhere for an hour

perhaps check the following (with a sandbox account i would think)

make an order and pay with paypal. after paying with paypal you will be sent back to the site.
there you might see a page that says “order processing” which – when the notification gets received from paypal changes to “thank you etc etc ”
if the “order processing” page stays there for more than a few seconds / or a minute let’s say, ipn notifications have not been received (yet). if it changes to “thank you etc etc ” then the notification was received and the email sent (programmatically) alongside db updates etc etc

so if you see the “thank you” page but do not receive the order email then that email is being held in a queue somewhere in which case you need to investigate why it is not actually being sent to your order email address

PS: make sure your order email “from” address corresponds to the domain of the server ! if it does not, this may well explain this delay (hence the big red DMARC notice in th eplugin)