How do I manage SecureMailMerge licenses as a reseller?

Learn how IT resellers and MSPs can purchase, assign, and manage SecureMailMerge licenses for multiple client organizations.

Updated October 2026

This guide explains how IT resellers, MSPs, and software distributors can purchase and manage SecureMailMerge licenses on behalf of their clients.

How it works

As a reseller, you purchase subscriptions at securemailmerge.com/purchase and assign licenses to your clients’ email addresses through the licensing server. There is no separate reseller program - you use the same purchase page and pricing as any other customer. Each license covers one person’s own email address and can be reassigned within the subscription. Subscriptions renew automatically until cancelled.

The only volume discount is for 10 or more licenses bought through the SecureMailMerge SaaS offer on Microsoft AppSource, which bills through a Microsoft 365 subscription. That is a different listing from the add-in install listing. Microsoft purchase billing, quantity changes and cancellation use the Microsoft 365 admin center; license assignments still use the licensing server.

You have two approaches to structuring subscriptions:

Choose one subscription per client when clients need separate invoices, want to manage their own license assignments, or you want a clean separation between accounts. Choose one main subscription when you want to manage everything centrally and don’t need per-client invoicing. You can also mix both approaches - use a shared subscription for smaller clients and dedicated subscriptions for larger ones.

Subscription setup

One subscription per client

1. Go to securemailmerge.com/purchase
2. Log in with your Microsoft 365 account
3. Set the quantity to match the number of users the client needs
4. Complete the purchase
5. Assign the licenses to the client’s users at licensing.solinventum.com

Repeat for each client. Each subscription appears separately in your licensing server dashboard and generates its own invoice. You can rename each subscription on the licensing server to match the client’s name, making it easy to find the right one.

If a client wants to manage their own license assignments, set up delegated administration and grant assignment permission. Quantity changes, invoice access and audit-log access are separate permissions. Assignment delegates can see every license in their delegated subscription, so this only works with the one-subscription-per-client approach. Delegation does not transfer ownership or grant cancellation permission.

One main subscription

1. Go to securemailmerge.com/purchase
2. Log in with your Microsoft 365 account
3. Purchase the total number of licenses you need across all clients
4. Assign licenses to each client’s users by entering their email addresses at licensing.solinventum.com

The licensing server does not separate licenses by client within a single subscription. You will need to track which licenses belong to which client yourself - for example, in a spreadsheet. If you want to automate this, you can use the licensing API to assign and unassign licenses programmatically.

Managing licenses

Assigning licenses

Follow Assign licenses to your team, entering the email address of each client user who sends. You can choose whether to send welcome emails with installation instructions.

You do not need the add-in installed yourself to manage licenses.

Removing or reassigning licenses

Follow Remove or reassign a license.

The freed license can be reassigned to any user - including users at a different client organization.

Adding more licenses

Follow Add more licenses. Change quantity on the licensing server for website purchases, or in the Microsoft 365 admin center for Microsoft purchases, then assign the new licenses on the licensing server.

See Invoices and billing or Cancel your subscription for the management path that matches your purchase route.

Client installation

Installing the add-in and assigning a license are separate steps. Your clients can install SecureMailMerge in two ways:

• Self-install: Each user installs the add-in from the Get Add-ins menu in Outlook
• Admin deployment: The client’s IT administrator deploys it via Microsoft 365 Admin Center > Integrated Apps

In both cases, the license you assign through the licensing server is what removes the promotional footer. See Installation vs. Licensing for details.