---
title: "Setting up the Front SMTP relay"
slug: "front-smtp-relay-setup"
description: "Route Front email through Opensense for signatures: get the relay credentials in Opensense, then set up Other SMTP on each Front channel, on port 25 or 587."
updated: 2026-05-01T14:54:43.000Z
canonical: "https://help.opensense.com/docs/front-smtp-relay-setup"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.opensense.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Setting up the Front SMTP relay

## Overview

This article explains how to configure an SMTP relay in Front, so that outbound messages sent from Front, from individual and shared inboxes, are routed through Opensense for signature application.

## Before you start

You need:

- Front admin access, to configure channel settings
- Opensense admin access, to get your relay credentials


## Step-by-step guide


### Step 1: Get your relay credentials from Opensense

Opensense generates your SMTP relay credentials per domain. You need them to complete the Front configuration.

1. Sign in to Opensense as an admin.
2. Go to **Manage** > **Domain Settings** > **Routing** > **Relay**.
3. Copy these values. You enter them in Front in the next step.

<dl class="kb-insights-summary">
  <div><dt>Host</dt><dd><code>crm-relay.sendergen.com</code></dd></div>
  <div><dt>Port</dt><dd>25 or 587. See step 6 in the next section for which to use.</dd></div>
  <div><dt>Username</dt><dd>Your domain-specific relay address (for example, <code>yourdomain@sendergen.com</code>)</dd></div>
  <div><dt>Password</dt><dd>The generated password shown on this page</dd></div>
</dl>

![Opensense Domain Settings Routing Relay page showing relay host, username, and password fields](https://help.opensense.com/media/image-44-943e7b8f51ee.png)

### Step 2: Configure the SMTP relay in Front

Repeat these steps for each channel (inbox) that should route mail through Opensense.

1. In Front, go to **Settings**, and select **Workspace** for a shared inbox, or **Me** for an individual inbox.
2. Select **Channels** in the left sidebar, and select the channel you want to configure.
3. Open the channel's **Settings** tab.
4. Under **Send Outbound Messages**, edit **Other SMTP** (select **Modify**).
5. Enter the relay credentials from Opensense: the host, your username, and your password.
6. Choose the port, based on your TLS setting:
   - **587:** if **Connect with SSL/TLS encryption** is turned on in Front.
   - **25:** if **Connect with SSL/TLS encryption** isn't turned on in Front.
7. Select **Test** to check the connection, and then save.

<div class="kb-media-carousel" data-kb-media-carousel aria-label="Configuring the SMTP relay in Front">
  <div class="kb-media-carousel__viewport">
    <figure class="kb-media-frame"><div class="kb-media-frame__visual"><img src="https://help.opensense.com/media/image-39-f07d003b28c0.png" alt="Front Settings, with the workspace selector, the settings gear, and Channels highlighted" width="1935" height="915" loading="lazy" decoding="async"></div><figcaption><strong>Channels</strong> · In your workspace Settings</figcaption></figure>
    <figure class="kb-media-frame"><div class="kb-media-frame__visual"><img src="https://help.opensense.com/media/image-47-9a965efcff0e.png" alt="A shared mailbox channel's Settings tab, with Send Outbound Messages set to Other SMTP server and a Modify button" width="1935" height="915" loading="lazy" decoding="async"></div><figcaption><strong>Modify</strong> · For a channel that already uses Other SMTP</figcaption></figure>
    <figure class="kb-media-frame"><div class="kb-media-frame__visual"><img src="https://help.opensense.com/media/image-45-6450611c7909.png" alt="Front SMTP relay configuration dialog with host, port, username, and password fields" width="1935" height="915" loading="lazy" decoding="async"></div><figcaption><strong>The SMTP relay settings</strong> · Host, port, username, and password</figcaption></figure>
  </div>
</div>

Front confirms the relay connection. Outbound messages from this channel now route through Opensense for signature application.

![Front SMTP relay test confirmation showing a successful connection](https://help.opensense.com/media/image-42-f6b567027c26.png)


## What's next

- [Connecting Front to Opensense](https://help.opensense.com/docs/front)
- [Adding the Opensense signature block to Front signatures](https://help.opensense.com/docs/front-plaintext-signature-block)

For further help, contact Opensense Support at [help@opensense.com](mailto:help@opensense.com).