Configure Gitlab SMTP Setting

Gitlab CE or EE is shipped with the capability to send messages through SMTP service as the basic feature to send notifications or updates to the users. The configuration parameters are available in /etc/gitlab/gitlab.rb. Each SMTP service provider has a different configuration, therefore the Gitlab configuration parameters should be adjusted according to the requirements. Some examples have been provided by Gitlab here.

This is an example if you use the Zoho service.

gitlab_rails['smtp_enable'] = true
gitlab_rails['smtp_address'] = "smtp.zoho.com"
gitlab_rails['smtp_port'] = 587
gitlab_rails['smtp_authentication'] = "plain"
gitlab_rails['smtp_enable_starttls_auto'] = true
gitlab_rails['smtp_user_name'] = "gitlab@mydomain.com"
gitlab_rails['smtp_password'] = "mypassword"
gitlab_rails['smtp_domain'] = "smtp.zoho.com"

This is another example of using Amazon SES with TLS communication.

gitlab_rails['smtp_enable'] = true
gitlab_rails['smtp_address'] = "email-smtp.region-1.amazonaws.com"
gitlab_rails['smtp_port'] = 465
gitlab_rails['smtp_user_name'] = "IAMmailerKey"
gitlab_rails['smtp_password'] = "IAMmailerSecret"
gitlab_rails['smtp_domain'] = "yourdomain.com"
gitlab_rails['smtp_authentication'] = "login"
gitlab_rails['smtp_ssl'] = true
gitlab_rails['smtp_force_ssl'] = true

The last thing which is important to successfully send a message, we need to set the sender information that is allowed by the target SMTP server.

gitlab_rails['gitlab_email_from'] = 'gitlab@example.com'
gitlab_rails['gitlab_email_reply_to'] = 'noreply@example.com'

After the changes, we need to reconfigure and restart the Gitlab instances. Then, to check whether the email feature works correctly, we can test it using command-line tools.

First, access the Gitlab Rails console.

gitlab-rails console -e production

Then, check whether the configuration is correct.

ActionMailer::Base.delivery_method
ActionMailer::Base.smtp_settings

Finally, try to send a message.

Notify.test_email('email@company.com', 'Test Message', 'This is a test message').deliver_now

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