can your server actually send emails ?
secondly, i would suggest you turn on debug by adding this to your wp-config.php

define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);

and check if there’s anything in the wp-content/debug.log

also, using phpmailer (i.e 3rd option in mail delivery) might give you more detailed errors

and what does your debug.log say ?

i already did:

add

define(‘WP_DEBUG’, true);
define(‘WP_DEBUG_LOG’, true);
define(‘WP_DEBUG_DISPLAY’, false);

to your wp-config.php

and do an order

then check debug.log in wp-content and check what it says

>I am able to edit php files.

good

>I have no debug.log in wp-content. Do I have to create it on my own and upload it, or what should i do?

add the debug declarations as mentioned above and the log will be created for you (unless you have some REALLY restrictive permissions – unlikely)

>Okay do you have any link, or idea where i can find good tip

ehem , google.com perhaps ?
it is – most likely y- our server not sending emails full stop. as i have no idea about your server settings / setup I cannot even begin to guess.
i can assure you the plugin itself sends emails . but the server has to actually send them out

do the orders show up in your order history ?

i would do the following to – maybe – narrow it down

use one of the wordpress smtp plugins to perhaps bypass your server and see if it sends then using some smtp settings

if that works, than it’s most definitely your server not sending the email

PS: if it shows up in the order history it – essentially means – no programming errors were encountered and the email was – programmatically speaking – sent .

after that , it’s the servers job to actually send it