> ## Documentation Index > Fetch the complete documentation index at: https://docs.knotie-ai.pro/llms.txt > Use this file to discover all available pages before exploring further. # Email settings (SMTP and Domain Email Service) > Choose between custom SMTP or Domain Email Service for sending white-label emails from your portal. ## What Email Settings is for Email Settings controls how your portal sends white-label emails (invites, notifications, and system messages). You typically choose one of two options: * **Custom SMTP Server** (bring your own mail server) * **Domain Email Service** (one-click setup to send from your domain) ## Where to find it 1. Open **Settings**. 2. Scroll to **Email Settings**. ## Option A: Configure a custom SMTP server 1. Click **Configure SMTP**. 2. Toggle **Use Custom SMTP**. 3. Fill in: * SMTP Host * SMTP Port * SMTP Username * SMTP Password * From Email * From Name 4. Acknowledge the risk checkbox (required). 5. Click **Test Connection** (recommended). 6. Save. Notes: * If you already have a saved password, you may not need to re-enter it unless you're changing it. * **Test Connection** sends a check to your SMTP server so you can confirm the details work before saving. ### SMTP security and vulnerabilities When using custom SMTP, be aware of potential security considerations: * **Credential exposure** – SMTP credentials are stored in the database. Use a dedicated email account with limited permissions. * **Connection security** – Always use TLS/SSL (port 465 or 587) to encrypt the connection. * **Rate limiting** – Some SMTP providers have rate limits. Monitor your sending volume. * **SPF/DKIM/DMARC** – Configure these DNS records to improve deliverability and prevent spoofing. The UI includes a risk acknowledgment checkbox to ensure you understand these considerations before enabling custom SMTP. SMTP Configuration with Security Warning ## Option B: Enable Domain Email Service (irreversible) The Settings page includes a **Domain Email Service** block with an **Activate** button. Important: * The UI warns this is **irreversible**. * Once enabled, **SMTP cannot be re-enabled**. When you click **Enable Domain Email Service**, the portal redirects you to: * `/partner/settings/email-domain` Follow that page’s domain verification steps. ### Post-activation state After Domain Email Service is activated, the UI changes significantly: * **Configure SMTP** button becomes **disabled** with text: "Inactive — Disabled - Domain Email Service is active" * The **Activate** button is replaced with an **Active** status badge * The Domain Email Service block shows an irreversibility warning > This page describes the *first-time setup* experience. If your account already has Domain Email Service active, the main buttons will be disabled or hidden. ## Troubleshooting * **Configure SMTP is disabled** * Domain Email Service is active. * **SMTP test fails** * Confirm host/port. * Confirm username/password. * Confirm your SMTP provider allows the sender address. ## Screenshots Email Settings section in Partner Settings — Domain Email Service shown as Active (with the irreversible-operation warning), Custom SMTP Server shown as Inactive and disabled because Domain Email Service is active, plus the Stripe Connect panel below SMTP Settings modal with Use Custom SMTP Server toggle and warning that email features will not be available without proper SMTP setup SMTP Settings modal with Use Custom SMTP Server enabled and host, port, username, password, from email, and from name fields