For transactional emails in WordPress, I am using WP Mail SMTP plugin and defining Email Authentication constants in wp-config.php file to add Third party Email services configurations.
Problem: I have mentioned all the configurations in the wp-config file and below is the screenshot. This is working perfectly fine on another website on the same host and sending all the emails.
On the above WP SMTP, you can see that the plugin configuration setting page is not reading those wp-config files constants that I defined.
I am looking for the problem that I could not figure out yet, anyone who has gone through the same issue, Please help me solve it?
It could be server side issue or some of the other plugins or theme's script conflicting with WP Mail SMTP plugin. Also, make sure which PHP version is installed on your server.
