---
title: "Unable to send e-mail"
date: "2015-01-07"
category: "email"
slug: "unable-send-e-mail"
---

## Overview

Your mail client can receive e-mail but cannot send. This applies to desktop and mobile mail clients only -- webmail ([[accessing-e-mail]]) is not affected. If you cannot both send and receive, see [[accessing-e-mail]] for correct login details.

## Common Causes

### ISP Firewall Blocking Port 25

ISPs commonly block outbound port 25 to reduce spam from compromised computers. Change your SMTP port to **587** in your e-mail client settings.

### Local Firewall or Security Software

Software such as Norton Internet Security or AVG may block communication with the SMTP server in certain configurations. Refer to the software's documentation for assistance.

### Relay Access Denied

Your e-mail client has not enabled outgoing authentication with the mail server. Authentication is required so that only authorized accounts can send mail through the server. See [[accessing-e-mail]] for correct settings.

### Invalid Login or Password

Verify the user can send outgoing e-mail:

1. In the [[logging-into-the-control-panel]], go to **User** > **Manage Users**
2. Click **Edit** for the affected user
3. Under **General Service Configuration** > **E-Mail** > **Advanced**, verify that "_User may send e-mail through server_" is checked
4. If the setting is already enabled, verify your [[accessing-e-mail]] credentials and reset the password

![Confirmation dialog that SMTP is enabled via Manage Users.](kb-image:smtp-enabled.png)
*Confirmation dialog that SMTP is enabled via Manage Users.*
