I'm trying to setup gitlab with email authentication. I used the following configs picked up from: https://docs.gitlab.com/omnibus/settings/smtp/

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'] = "admin@jambusys.com"

gitlab_rails['smtp_password'] = "------------"

gitlab_rails['smtp_domain'] = "smtp.zoho.com"

gitlab_rails['gitlab_email_from'] = 'admin@jambusys.com'

gitlab_rails['gitlab_email_reply_to'] = 'noreply@jambusys.com'

gitlab(prod)> Notify.test_email('admin@jambusys.com', 'Message Subject', 'Message Body').deliver_now

app/mailers/application_mailer.rb:14:in `block in <class:ApplicationMailer>': ApplicationMailer::SMTPConnectionError (ApplicationMailer::SMTPConnectionError)