If you would rather send application email via an SMTP server instead of via Sendmail, add the following configuration information to /etc/gitlab/gitlab.rb and run gitlab-ctl reconfigure.
Outlook
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gitlab_rails['smtp_enable'] = true
gitlab_rails['smtp_address'] = "smtp-mail.outlook.com"
gitlab_rails['smtp_port'] = 587
gitlab_rails['smtp_user_name'] = "odc-gitlab@outlook.com"
gitlab_rails['smtp_password'] = "******"
gitlab_rails['smtp_domain'] = "ODC-Gitlab"
gitlab_rails['smtp_authentication'] = "login"
gitlab_rails['smtp_enable_starttls_auto'] = true
# gitlab_rails['smtp_tls'] = true
gitlab_rails['smtp_openssl_verify_mode'] = 'peer'
