Plans & billing
Your plan determines the quotas (domains, mailboxes, volume, quarantine retention) and features.
For customers
Under Billing you see your current plan, can switch, and download your invoices as PDF. Limits are enforced live – you cannot create more domains/mailboxes than your plan allows.
For the vendor
Platform admins manage plans (SaaS subscriptions and self-hosting licenses), coupons and invoices under Settings → Billing (management).