An MSP manages signatures across tenants by attaching each client to one reseller account for billing and, once a Microsoft 365 administrator of that client approves, opening that client's console from its own account. An MSP or Microsoft 365 reseller rarely administers just one organization: it juggles dozens of tenants, each with its own employees, groups and branding. Email signatures are a classic friction point — repetitive to configure, hard to keep current, and often left to each user's discretion. A well-designed reseller program turns that headache into a billable recurring service.
- Why manage your clients' signatures?
- Several organizations, one entry point
- How the reseller program works
- Accessing a client's console
- What you see in the console
- How you earn
- Reseller-set pricing and per-seat billing
- ATOM and Exclaimer MSP Connect, side by side
- Canadian hosting and Law 25 for your clients
- Deploying signatures at a client
- Frequently asked questions
Why manage your clients' email signatures?
For an MSP, the email signature is a low-effort, high-visibility service. It touches every employee, every day, on every message sent — yet it usually escapes any governance. Typical challenges across a multi-client fleet:
- Consistency: each client wants a uniform signature, but letting employees compose their own produces dozens of wobbly variants.
- Updates: a new logo, a changed number, an added confidentiality notice — impossible to propagate manually across hundreds of mailboxes.
- Turnover: a departure or a new hire means removing or adding a signature quickly, on the right tenant.
- Recurring revenue: offering signature management as a managed service creates a predictable monthly billing line.
By centralizing this service, the reseller turns a manual chore into a packaged offering, while respecting each end client's brand.
Several client organizations, one entry point
ATOM Signatures is multi-tenant by design: one tenant maps to one Microsoft 365 organization. Each client keeps its signatures, groups, assets and branding in a space strictly isolated from the others. Isolation is enforced at the database level, not only in the interface — one client's data cannot leak to another.
The reseller, in turn, gets a bird's-eye view: it attaches its clients to its account and tracks, in its reseller console, their price, seats, payment status, last activity and its payouts. That console is for commercial follow-up. Managing a client's signatures goes through the partner access that the client's Microsoft 365 administrator has authorized, opened from the MSP's own account, with no guest account or shared password, and always within the airtight boundary between organizations.
How the ATOM reseller program works
The program rests on a simple hierarchy: one reseller account, to which client accounts attach. To join, the reseller writes to ATOM, which sends it a single-use invitation link, valid for 7 days: by following it, it activates its reseller account after consenting to Microsoft 365 access for its organization, with no payment or subscription on its side. Before sending its first invitation or creating an affiliate link, it must complete its Stripe sign-up. Its clients are attached either through a single-use invitation or through a reusable affiliate link to place on its website, in its emails or in its ads: the client follows the invitation or link to activate its own tenant and consent to Microsoft 365 access, and every company that signs up through an affiliate link is attached to the reseller. In both cases, the client sees the reseller's price before consenting to Microsoft 365 access. Once attached, the client appears in the reseller's dashboard.
| Aspect | Case-by-case management | ATOM reseller program |
|---|---|---|
| Accounts to administer | A separate subscription per client | One reseller account, clients attached |
| Billing | One invoice per organization | Each client is billed by ATOM at the reseller's price |
| Pricing | Public price per seat | Reseller's own signatures free; reseller-set pricing, recommended at CA$1 per seat per month (CA$12 per year), floor of CA$0.75 per month (CA$9 per year) for nonprofits and the public sector |
| Branding | Reconfigured each time | End client's brand, configured by the reseller once access is authorized |
| Data isolation | Accounts kept separate manually | Guaranteed per-tenant isolation |
The reseller remains its client's commercial point of contact: it presents the service as part of its managed offering and chooses whatever price it deems appropriate, monthly (from CA$0.75 per seat) and/or annual (from CA$9 per seat). Once the client has authorized access to its console, the reseller configures that client's branding (logo, colours, links).
Accessing a client's console
Attachment is about billing: on its own, it gives no access to the client's console. Access is a separate authorization that only a Microsoft 365 administrator of the client can grant, and it does not depend on attachment: a client subscribed directly to ATOM can also authorize its MSP, as long as the MSP is an ATOM reseller.
- From the "Managed clients" area of its console, the MSP chooses "Request access to a client" and gets a single-use link, valid for 7 days.
- It sends that link (a ready-to-send message is provided) to a Microsoft 365 administrator of the client. The administrator checks the partner's identity, chooses the role and approves.
- The MSP then opens the client's console with one click on "Open", from its own account.
The client chooses between two roles. The Editor can create, edit, enable and duplicate signatures, manage banner campaigns, view statistics and satisfaction surveys, and see groups, seats and connections. The Administrator can do the same, and also manage billing and console settings.
Access lasts until revoked: the client can change the role or remove the access at any time, and the partner then loses access immediately. The MSP team's actions are recorded in the client's log. A partner never manages access to the client's console, and it creates no token or API key: those remain in the hands of a client administrator.
What you see in the console
Your console brings together two areas, opened from your own Microsoft 365 account:
- Reseller portfolio: your attached clients, with for each one the price, the billing interval, your per-seat margin, the payment status, the next renewal, the seats in use and the last activity. The same page also holds your invitation links, your affiliate links and your Stripe payout history.
- Managed clients: the clients that have authorized you to manage their console. The "Open" button takes you into a client's console, and a banner reminds you at all times that you are managing it as a partner. The "Open another client" selector moves you from one client to the next, and "Back to my organization" returns you to your own console.
For a new client, two steps: your invitation or affiliate link attaches it to your account, for billing at your price, then "Request access to a client" produces the link that its Microsoft 365 administrator approves (see Accessing a client's console). The client then appears in both areas.
How you earn
The model comes down to four points, with no membership fee and no minimum number of clients or seats:
- You set your price. You choose the per-seat price with every invitation and every affiliate link, monthly and/or annually, plus tax. Recommended price: CA$1 per month or CA$12 per year, ATOM's public price. Floor price: CA$0.75 per month or CA$9 per year, recommended for nonprofits and the public sector.
- ATOM bills your clients. Each client pays ATOM directly, through Stripe, at the price you chose: you have no invoice to issue and no payment to collect.
- ATOM pays you the margin. On each payment collected, ATOM keeps its per-seat share and pays you the margin through Stripe Connect, before tax and net of Stripe's payment fees, starting from each client's first payment.
- Your own signatures are free. Your organization uses ATOM Signatures at no cost, and you never pay ATOM.
Your partner price, meaning the per-seat share that ATOM keeps, is shown in your reseller console as soon as your account is activated, along with the per-seat margin that results from the price you choose.
Volume example: 10 clients with 25 seats each add up to 250 seats billed at your price, monthly or annually depending on the interval each client chooses. Every seat a client adds increases that volume, with no billing work on your side.
Reseller-set pricing and per-seat billing
The reseller's own signatures are free, and it never pays ATOM: only its clients' seats are billed, and the client is the one who pays. A seat corresponds to a distinct sender address to which a signature is applied during the cycle, and the number of billed seats is the number of seats subscribed for the client, not a usage statement.
Reseller-set pricing, recommended at CA$1 per seat per month or CA$12 per year. That is ATOM's public price. The floor price, CA$0.75 per month or CA$9 per year, is the minimum selling price; we recommend it for nonprofits and the public sector. The reseller chooses its price itself with every invitation and every affiliate link, monthly and/or annual (at least one of the two), plus tax, in Canadian dollars; the fields are pre-filled with its default price. The chosen price is locked in for the attached client, and the reseller can then adjust it client by client. The client sees that price, or both, before consenting to Microsoft 365 access; where the reseller offers both intervals, it chooses at subscription. It is then billed directly by ATOM for the number of seats it subscribes to. A client on a monthly subscription can switch to annual if its reseller offers it an annual price. Added seats are billed right away, prorated; a reduction applies at renewal, and a price change decided by the reseller applies from the next renewal, never mid-period. An attached client's signatures are active as soon as its free trial or subscription begins.
ATOM keeps its per-seat share and the taxes, and pays the margin to the reseller through Stripe Connect, before tax, on each payment collected and once the reseller's Stripe sign-up is complete, net of the actual Stripe payment fees on that payment. If a payment is refunded or disputed, the matching margin is cancelled pro rata. The reseller's console shows, client by client, the price, the billing interval, ATOM's share, the margin, the payment status, seat usage, and the payout history, Stripe fees included.
A reseller's client gets the 14-day free trial, offered once per organization. Since no payment is collected during the trial, no margin is paid to the reseller during that period; it is paid starting from the client's first payment.
An organization already subscribed directly to ATOM cannot be attached to a reseller, nor become a reseller itself.
How does ATOM compare with Exclaimer's MSP Connect?
On August 19, 2026, Exclaimer announced MSP Connect, which it describes as "a new partner program that enables managed service providers to provision, manage and grow centralized email signature services across multiple customer environments". The middle column below restates what Exclaimer says about it; the right column describes what ATOM does. This page compares nothing else: Exclaimer's prices and margins are not published in the sources consulted, so none are compared here.
| Point | MSP Connect, according to Exclaimer | ATOM reseller program |
|---|---|---|
| Who pays the vendor | "MSPs pay a predictable monthly fee based on actual customer usage" (consumption-based billing) | Each client pays ATOM its own subscription, at the price its reseller set; the reseller never pays ATOM |
| Reseller income | "Partners can generate license margin" | ATOM pays the reseller its margin through Stripe Connect |
| Where the MSP works | "A single place to provision and manage email signatures across multiple customer environments" (partner portal) | A reseller console for the portfolio, billing and payouts, and each client's own console opened from the MSP's account |
| Access to a client's environment | Not detailed in the sources consulted | Only after a Microsoft 365 administrator of the client approves; Editor or Administrator role; valid until revoked; the MSP's actions are logged in the client's log |
Exclaimer's announcement also mentions PSA integrations and NFR licensing; this page does not compare them. Everything in the middle column comes from Exclaimer's announcement of August 19, 2026, its partner-recruitment page and the ITWeb article of October 5, 2026, which is marked "Issued by Exclaimer". For a full product-by-product comparison, see ATOM vs Exclaimer. Check the vendor's current terms before you decide: programs change.
Canadian hosting and Law 25 for your clients
For an MSP serving Quebec organizations, data hosting is a concrete selling point. Each client's configuration data — signatures, contact details, branding — is hosted in Canada. And because the signature is inserted client-side by an add-in in Outlook, the email itself is never routed through a third-party server: it never leaves Microsoft 365.
This architecture reduces your clients' exposure to Law 25, Quebec's reform of personal information protection. You can present data sovereignty as a differentiator of your managed offering, rather than a risk to explain away. To go deeper, see the email signatures and Law 25 guide and the one on Canadian data residency.
Statements relating to Law 25 are provided for information purposes and do not constitute legal advice. Each client organization remains accountable for its employees' personal information.
Deploying signatures at a client
Deployment follows the same path for each client, which makes onboarding repeatable and fast:
- Send the client your single-use invitation or your affiliate link, created once your Stripe sign-up is complete: it activates its Microsoft 365 tenant after the client has seen your price.
- Request access to its console, as described above: a Microsoft 365 administrator of the client authorizes it.
- Compose its signatures in the visual editor and configure its branding.
- Target the right employees using existing Microsoft 365 groups.
- A client administrator generates the add-in manifest URL in the Connections tab of its console (this step is not available from partner access), then the central deployment is done from the client's Microsoft 365 admin center.
- Verify insertion, then move on to the next client.
Deploying the add-in is the same as for a single organization: the deploy a signature for the whole organization guide covers each step.
Frequently asked questions
Can an MSP manage the signatures of several clients with ATOM?
Yes. ATOM Signatures is multi-tenant: each client organization has its own isolated Microsoft 365 tenant, with its signatures, groups and branding. The reseller attaches its clients to its account, tracks their price, seats and payments there, and manages their signatures with each client's authorization, without ever mixing one client's data with another's.
How does billing work for a reseller?
The reseller never pays ATOM: its own signatures are free, and its clients are the ones billed. It chooses the per-seat price freely with every invitation and every affiliate link, monthly and/or annually, plus tax: recommended price CA$1 per month or CA$12 per year, floor price CA$0.75 per month or CA$9 per year, recommended for nonprofits and the public sector; each client is billed directly by ATOM at that price, and chooses the interval at subscription when the reseller offers both. ATOM keeps its per-seat share and pays the margin to the reseller through Stripe Connect, net of Stripe's payment fees; the reseller must have completed its Stripe sign-up before inviting a first client. No margin is paid during a client's free trial, since no payment is collected. An organization already subscribed directly to ATOM cannot be attached to a reseller, nor become a reseller.
Do client data stay separated and in Canada?
Yes. Isolation between tenants is enforced at the database level, and each client's configuration data is hosted in Canada. The signature is inserted client-side in Outlook: the email is never routed through a third-party server, which simplifies Law 25 compliance for your Quebec clients.
Can I offer the signatures as white-label?
No. ATOM Signatures is not offered as white-label: the console and billing are ATOM's, and you remain your client's commercial point of contact. Once the client has authorized access to its console, you configure its branding (logo, colours, links); the deployed signature carries the end client's brand, not ATOM's or a third party's.
How does an MSP access its client's console?
Through an authorization separate from attachment. The MSP requests access from the "Managed clients" area of its console, and a Microsoft 365 administrator of the client approves by choosing the Editor or Administrator role. The MSP then opens the client's console from its own account, with no guest account or shared password. Access lasts until revoked: the client can change the role or remove it at any time, and the MSP's actions appear in the client's log.
What is the partner price?
Your partner price, meaning the per-seat share that ATOM keeps, is shown in your reseller console as soon as your account is activated, along with the per-seat margin that results from the price you choose. It is shared with resellers only, in their console.
How long does it take to get started?
Getting started follows a few steps: you write to ATOM at info@atomsolutions.ca, ATOM sends you a single-use invitation link valid for 7 days, you follow it and consent to Microsoft 365 access for your organization, which activates your reseller account, then you complete your Stripe sign-up and send your first invitation or affiliate link. How long it takes depends mostly on two steps: receiving ATOM's invitation and Stripe's verification of your sign-up.
Is there a minimum number of clients or seats?
No. The program has no minimum number of clients or seats. Each client subscribes to the number of seats it needs, like a client subscribed directly to ATOM.
How does ATOM compare with Exclaimer's MSP Connect?
On August 19, 2026, Exclaimer announced MSP Connect, a partner program for provisioning and managing signatures across several customer environments, with consumption-based billing paid monthly by the MSP and a partner portal. With ATOM, each client pays ATOM its own subscription at the price its reseller sets, the reseller never pays ATOM, and ATOM pays the reseller its margin through Stripe Connect. The reseller opens a client's console only after a Microsoft 365 administrator of that client approves. The description of MSP Connect comes from Exclaimer's own announcement; check Exclaimer's current terms.
Become an ATOM Signatures reseller. Track the billing of all your Microsoft 365 clients from a single account and manage their email signatures with their authorization, at a price you choose, your own signatures free, with configuration data hosted in Canada.
Go further: the comparison of email signature software in Canada and about ATOM Solutions.
Sources
- Exclaimer — press release "Exclaimer launches MSP Connect to remove billing and management friction for MSPs" (August 19, 2026): exclaimer.com
- ITWeb — "Maintain brand consistency with MSP Connect" (October 5, 2026, issued by Exclaimer): itweb.co.za
- Exclaimer — MSP Connect partner recruitment page: exclaimer.com
Sources consulted on November 2, 2026. The ATOM column describes ATOM's own program.