I have used WordPress and are familiar with WordPress plug-ins.

If you have used WordPress and are familiar with the WordPress plug-in, please invite the predecessors who have recently been assigned a task to change the company's online bug. The younger brother is not familiar with network programming, so the general situation of asking for advice is, our company built WordPress on the intranet, and loaded a third-party plug-in named Achievements to create an achievement system for the intranet. now we have used WordPress as a bug, familiar with WordPress plug-ins
Recently, I was assigned a task to change my company's online bug. I am not familiar with network programming, so I come to ask for advice.

In general, our company built WordPress on the intranet. it loaded a third-party plug-in named Achievements to create an achievement system for the intranet, there is a bug that someone should receive an email in the company mailbox after their achievements, but there is a problem with the email.

How to fix this bug? Should I first study the source code of this plug-in, check how the mail was sent, and then analyze the specific situation ??

At last, I don't know what these plug-ins look like. Are there some php pages ??

Can you give me some idea about this situation ??
------ Solution --------------------
You must study the source code of this plug-in. if you are not familiar with it, it will be fixed at half past one.
Plug-ins are placed under wp-content/plugins in the root directory. each plug-in occupies a folder and is independent from each other. it is also independent of the system and can be easily found through the plug-in name.
Good luck ~
------ Solution --------------------
Is there a problem with the email received?
What's the problem?