can't work,
I use the docker version, 8.8.3
and config GITLAB_OMNIBUS_CONFIG
external_url 'http://code.simcu.com'
registry_external_url 'https://registry.simcu.com'
mattermost_external_url 'http://chat.simcu.com'
gitlab_rails['gitlab_email_from'] = 'code@service.simcu.com'
gitlab_rails['gitlab_email_display_name'] = 'SIMCU CODE'
gitlab_rails['gitlab_email_reply_to'] = 'code@service.simcu.com'
gitlab_rails['smtp_enable'] = true
gitlab_rails['smtp_address'] = "xxxx"
gitlab_rails['smtp_port'] = 25
gitlab_rails['smtp_user_name'] = "xxxxx"
gitlab_rails['smtp_password'] = "xxxx"
gitlab_rails['smtp_authentication'] = "login"
gitlab_rails['smtp_enable_starttls_auto'] = false
gitlab_rails['smtp_ssl'] = false
gitlab_rails['smtp_tls'] = false
gitlab_rails['smtp_openssl_verify_mode'] = 'none'
gitlab_rails['gitlab_default_projects_features_container_registry'] = true
gitlab_rails['registry_path'] = "/var/opt/gitlab/registry/"
mattermost['team_enable_team_creation'] = true
but it can't work well , you can visit chat.simcu.com