miturbe

SOLVED:
Looking at the code, I saw that this application gets the hostname from the PHP SERVER_NAME variable, instead of getting it from WordPress values.
So in the NGINX server File, the value was

server_name *.domain.org;

I changed this to:
server_name domain.org *.domain.org;

And this solved the issue

• This reply was modified 4 years, 9 months ago by miturbe.

Updated to version WP Mail SMTP: 2.1.1
Problem persists.