Tracking open email does not work

I installed Mautic on CentOS 7 with Nginx + PHP-FPM.

But I’m having a problem with tracking open email that do not work.

After I check, it turns out the pixel tracking http://domain.com/email/xxxxx.gif at the bottom of the email direct to 404 page not found.

I think the problem is in the virtual host configuration, maybe something missing or wrong.

Please help me to solve this problem.

You Just send email through campagin and then check please.