---
title: "Set Up the SMTP Relay in Front for Opensense Signature Application"
slug: "front-smtp-relay-setup"
description: "Learn how to configure an SMTP relay in Front to route outbound email through Opensense for signature application. Covers credential retrieval from Opensense, port selection (25 or 587), and per-channel setup for individual and shared inboxes."
updated: 2026-05-01T14:54:43Z
published: 2026-05-01T14:54:43Z
canonical: "help.opensense.com/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.

# Front SMTP Relay

## Overview

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

## Before you start

You'll need:

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

## Step-by-step guide

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

Your SMTP relay credentials are generated per domain in Opensense. You'll need these to complete the Front configuration.

1. Log in to Opensense as an admin.
2. Navigate to **Manage > Domain Settings > Routing > Relay**.
3. Copy the following values — you'll enter them in Front in the next step:
  - **Host:** crm-relay.sendergen.com
  - **Port:** 25 or 587
  - **Username:** your domain-specific relay address (for example, yourdomain@sendergen.com)
  - **Password:** the generated password shown on this page

![Opensense Domain Settings Routing Relay page showing relay host, username, and password fields](https://cdn.document360.io/05b0e12d-96a6-4b75-a423-672ab2be88d7/Images/Documentation/image(44).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, navigate to **Settings** and select either **Workspace** or **Me** depending on whether you are configuring a shared or individual inbox.
2. Select **Channels** from the left sidebar and select the channel you want to configure.
3. Open the **Settings** tab for that channel.
4. Under **Send Outbound Messages**, edit **Other SMTP**.

![Front channel settings showing Send Outbound Messages section with Configure SMTP relay option](https://cdn.document360.io/05b0e12d-96a6-4b75-a423-672ab2be88d7/Images/Documentation/image(39).png)

![Front SMTP relay configuration dialog with host, port, username, and password fields](https://cdn.document360.io/05b0e12d-96a6-4b75-a423-672ab2be88d7/Images/Documentation/image(45).png)

![](https://cdn.document360.io/05b0e12d-96a6-4b75-a423-672ab2be88d7/Images/Documentation/image(47).png)

1. Enter the relay credentials from Opensense:
  - **Host:** crm-relay.sendergen.com
  - **Username:** your domain-specific relay address (for example, yourdomain@sendergen.com)
  - **Password:** your generated relay password from Opensense
  - **Port:** choose based on your TLS preference:
    - **587** — use this if “Connect with SSL/TLS encryption” is enabled in Front
    - **25** — use this if “Connect with SSL/TLS encryption” is not enabled in Front

1. Click **Test** to verify the connection, then save.

![Front SMTP relay test confirmation showing a successful connection](https://cdn.document360.io/05b0e12d-96a6-4b75-a423-672ab2be88d7/Images/Documentation/image(42).png)

**Expected result:** Front confirms the relay connection. Outbound messages from this channel will now route through Opensense for signature application.

## Related articles

- [Connect Front to Opensense via the Front API](/v1/docs/front)
- Setting up the plaintext block in Front
- [Front Preset Signatures](/v1/docs/front-preset-signatures)

## Opensense Support

For further assistance, contact Opensense Support:

- Email: [help@opensense.com](mailto:help@opensense.com)
- Knowledge Base: [help.opensense.com](http://help.opensense.com)