Workspace branding
Upload a logo and favicon, set the product name, and choose a support email. These appear on the public site and in the app chrome.
Custom domain
Reseller workspaces can attach a domain. Add the DNS records shown in Settings, then wait for verification. TLS is issued after DNS is correct.
Transactional mail (invites, password reset) uses the platform mailer unless you configure your own SMTP in account settings.