> ## Documentation Index > Fetch the complete documentation index at: https://documentation.mysmtp.com/llms.txt > Use this file to discover all available pages before exploring further. # Setting Up SMTP Credentials > Learn what SMTP credentials are, how to generate them for custom domains or mySMTP, and how to test and troubleshoot common setup issues. ## **1. What Are SMTP Credentials?** SMTP credentials consist of:
✅ **SMTP Server host name** – The mail server responsible for sending emails. ( eg. relayxx.mysmtp.com)
✅ **SMTP Port** – The network port used for email transmission (e.g., 587, 25).
✅ **SMTP Username** – Usually the email address or an assigned username for authentication.
✅ **SMTP Password** – The password associated with the SMTP username, ensuring secure access. These details are used by email clients, applications, or automated systems to send emails reliably. ## **2. How to Generate SMTP Credentials** Generating SMTP credentials depends on your **email provider** or **SMTP relay service**. Below are common steps for setting up SMTP credentials: ### **🔹 For Custom Domains (e.g., Your Own Mail Server)** 1️⃣ **Access Your Email Hosting Provider's Dashboard** * Log into **cPanel, Plesk, or any email control panel** provided by your hosting service. 2️⃣ **Find the SMTP Settings Section** * Look for **"Mail Settings"**, **"SMTP Configuration"**, or similar options. 3️⃣ **Create a New Email Account or SMTP User** * If required, generate a new **SMTP username and password**. 4️⃣ **Note Down the SMTP Server and Port Information** ### **🔹 For Third-Party SMTP Providers (e.g., mySMTP)** 1️⃣ **Sign Up for an SMTP Relay Service** * Go to your chosen provider's website and create an account. 2️⃣ **Generate API Keys or SMTP Login Credentials** * Navigate to **SMTP settings** and create new credentials. 3️⃣ **Verify Your Domain and Authentication Records** * Add **SPF, DKIM, and DMARC** records to your DNS settings for improved deliverability. * Use [test.smtp.ai](https://test.smtp.ai) to verify setup. ## **3. Testing Your SMTP Credentials** Before sending emails, test your SMTP setup to avoid errors. 🔹 **Use [test.smtp.ai](https://test.smtp.ai) to check:**
✅ **Authentication (SPF, DKIM, DMARC)**
✅ **SMTP connectivity and response time**
✅ **Blacklist status** ## **4. Troubleshooting Common SMTP Issues** 🚨 **Incorrect Username/Password:** Double-check credentials and reset if necessary.
🚨 **Port Blocked by ISP:** Try switching to **587 (TLS)**
🚨 **Authentication Failed:** Ensure SMTP authentication is enabled in email settings.
🚨 **Emails Going to Spam:** Set up SPF, DKIM, and DMARC records correctly. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.