> Source: [sk108391](https://support.checkpoint.com/results/sk/sk108391)

# sk108391 - Spam emails are being relayed from SMTP servers behind the Security Gateway

| Property | Value |
|----------|-------|
| Solution ID | sk108391 |
| Date Created | 2015-11-16 |
| Last Modified | 2018-01-09 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20 |

## Symptoms

- * Spam emails are being relayed from SMTP servers behind the Security Gateway.
* A vulnerability scanner detects that the firewall is functioning as an open SMTP Relay.

## Cause

All emails sent to the MTA are forwarded to the SMTP server behind the firewall for delivery.

## Solution

This solution requires authentication. Please log in to view the full solution.

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