I have not tested but the guide tels me this:

WebSite X5 online Control Panel

WebSite X5 automatically sets up an online Control Panel for each website created with the Program. It is used by Site Administrators to: 

• display website hit (visits) statistics;
• handle comments on posts in the Blog or comments for the Comments and Ratings Object;
• display Dynamic Content Objects;
• display the users who have registered to access Members' Areas;
• handle orders in the e-commerce shopping cart and check stock availability levels.
• manage the comments the customer leave for the products of the online shop.

So the online control panel should help you (type admin behind your website home url login is in x5, step1 acces management)

Hello Bruno,

I just tested myself, if there is a shop comment you can set to receive an e-mail when a comment has made.

Also the email adres is mandatory, so it needs to be filled in by customer always.

I got a mail back with the customer email adres in it, also it is visible in the admin panel.

If you don't have it maybe customer filled in a fake email or so? (i need to test that)

But here is how it looks when i made a test;

You can do the same, you can remove the comment always after the test

mail:

admin panel:

So i don't understand why you won't see this, please test yourself, and make a prtscrn.

It is importand too use an email adres in x5 step5 of your own domain so an email adres from the domain where you have your website also hosted, maybe that can be an issue?

check if this is the case else, change and test again