How to explore an unfamiliar application in production?

Question

Ruby on Rails

Colleagues, hello everyone.
Prompt a way and tools.
There is an application on rails 4 + delayed_job. The application is quite ... hmm, specific, you can't say otherwise. I'm trying to figure out why the delayed_job task is not sending mail. In the logs, there is also a positive indication of the execution of the task, but as a result, the notification does not come.
I want to understand how and what is the best way to dig the application to find a plug?

Answer 1

the variant with config.action_mailer.delivery_method = :filethe same does not work.

Answer 2

Well, it’s logical to look at some kind of production log
, or if you run it in a test environment, then sending mail is probably turned off there

Answer 3

And show the code how you send mail, perhaps the problem is in it.