# Resolving the '550 sender verify failed' error message

> Fix the '550 sender verify failed' error by checking that the sending account exists and your MX settings are correct.

Source: https://helpcenter.ruachost.com/cpanel/guides/resolving-the-550-sender-verify-failed-error-message/

When sending e‑mail, you may encounter the SMTP error:

```
550 Sender verify failed
```

This error indicates that the mail server could not verify the sender’s address. It is a common anti‑spam measure known as **Sender Address Verification (Callback Verification).**

## Causes

- The **sender e‑mail account does not exist** in cPanel.
- The **domain’s MX records are misconfigured** in cPanel.
- Example: You add a parked domain or addon domain, but the MX records point to an external provider (like Google Workspace or Microsoft 365) without updating cPanel accordingly.

## Resolution Steps

### 1. Verify the E‑mail Account Exists

- Log in to **cPanel → Email Accounts**.
- Ensure the account you’re using actually exists.
- Confirm you’re using the correct **username** (full e‑mail address) and **password** for SMTP authentication.

### 2. Check MX Records

- If your domain uses a **remote e‑mail provider**, update MX entries in cPanel:

  1. Log in to **cPanel**.
  2. Go to **Email → Remote MX Wizard**.
  3. Select the domain.
  4. Configure it to use the remote provider (e.g., Google, Microsoft).

### 3. Adjust Mail Exchanger Settings

- In **cPanel → Email Routing**, ensure the domain is set to:

  - **Remote Mail Exchanger** if using external mail servers.
  - **Local Mail Exchanger** if using cPanel’s mail server.

> **Note:**
- Always create the e‑mail accounts you intend to send from in cPanel.
- If using external providers, MX records must match their requirements.
- Misconfigured MX entries are the most common cause of this error.