Set Up the SMTP Relay in Front for Opensense Signature Application

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.

Log in to Opensense as an admin.
Navigate to Manage > Domain Settings > Routing > Relay.
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

Step 2: Configure the SMTP relay in Front

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

In Front, navigate to Settings and select either Workspace or Me depending on whether you are configuring a shared or individual inbox.
Select Channels from the left sidebar and select the channel you want to configure.
Open the Settings tab for that channel.
Under Send Outbound Messages, edit Other SMTP.

Front channel settings showing Send Outbound Messages section with Configure SMTP relay option

Front SMTP relay configuration dialog with host, port, username, and password fields

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

Click Test to verify the connection, then save.

Front SMTP relay test confirmation showing a successful connection

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

Opensense Support

For further assistance, contact Opensense Support:

Email: help@opensense.com
Knowledge Base: help.opensense.com

Front SMTP Relay