In what may be the problem of configuration mailgun in laravel?

In mailgun, right in service, there is a wonderful web logs, where you can see what reached the addressee, and what is not and why.

Further, there mailgun make sure that the domain from which you send messages to active status.

Further, the above settings are incorrect, click on the domain in mailgun and copy the host, username, password in your settings.

where are the settings?

mailgun driver, host mailtrap, and without opoznovatelnyh characters is not configured nifiga.

Maybe the fact that mailtrap.io is only used for test messages?
You need to log in there and you do the same at the ACC will receive your messages
(not your post, namely the application)