Unable to connect GitLab with Mailgun

I am unable to send emails in GitLab, I am using the service Mailgun, below my settings:

sudo vim /etc/gitlab/gitlab.rb 
gitlab_rails['gitlab_email_from'] = ""
gitlab_rails['gitlab_email_reply_to'] = ""

gitlab_rails['smtp_enable'] = true
gitlab_rails['smtp_address'] = ""
gitlab_rails['smtp_port'] = 587
gitlab_rails['smtp_authentication'] = "plain"
gitlab_rails['smtp_enable_starttls_auto'] = true
gitlab_rails['smtp_user_name'] = ""
gitlab_rails['smtp_password'] = "secret"
gitlab_rails['smtp_domain'] = ""
sudo gitlab-ctl reconfigure
sudo gitlab-ctl restart

Does anyone have any idea how to solve this? Thanks.


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