Alternative · Letsignit

Switching from Letsignit: alternatives and a step-by-step migration

Leaving Letsignit? This guide lists the alternatives available — not just ATOM — and walks through, step by step, how to migrate your Microsoft 365 signatures without duplicate sends.

By the ATOM Solutions team · Updated

Have you decided to leave Letsignit, or are you seriously weighing the option? This guide is for anyone looking to replace Letsignit: what options exist — not just ATOM —, how to migrate your Microsoft 365 signatures without duplicate sends, and what you would lose by leaving.

In short: beyond ATOM, alternatives to Letsignit include CodeTwo, Exclaimer, Signitic and Microsoft 365's native signature. Switching to ATOM takes a few steps — connect the tenant, recreate templates with "Import HTML", reproduce targeting, deploy the add-in, then remove Letsignit — without disrupting email. For a detailed criterion-by-criterion comparison, see ATOM vs Letsignit.
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What pushes organizations to leave Letsignit?

For European data residency, the optional server-side mode, a marketing suite broader than most need, and currency and support based in France:

  • Data residency in Europe. Letsignit advertises 100% EU hosting and publishes no Canadian region in its official documentation.
  • An optional server-side mode. Beyond its Outlook add-in, Letsignit documents a server-side SMTP connector and an API for Outlook on the Web, which route email through its infrastructure for organizations that enable them.
  • A marketing suite broader than most need. Banners, campaigns, vCards and presentations each add a layer of configuration and cost that most organizations never use for a simple signature.
  • Currency and support based in France. The pricing page lets you display amounts in Canadian dollars, but the company, its infrastructure and its support remain based in France.

To dig into the architecture question, see our guide on routing-free architecture.

Alternatives to Letsignit

Replacing Letsignit does not automatically mean choosing ATOM. Here are the options Canadian organizations run into, and who each one fits.

  • ATOM Signatures. 100% Canadian hosting, strictly client-side architecture — email never leaves Microsoft 365 — and a single rate of CAD $1 per user per month (or CAD $12 per year), all-inclusive, with no license minimum and a 14-day free trial. Fits Canadian organizations on Microsoft 365 that want local hosting and a simple price. See pricing.
  • CodeTwo Email Signatures 365. A Polish vendor with a hybrid architecture (server-side Azure relay, optional client-side add-in), a 10-license minimum and tiered USD billing. Fits an organization that needs CRM integrations or a server-side architecture. See the ATOM vs CodeTwo comparison.
  • Exclaimer. A UK-based vendor with a broad marketing suite (banners, campaigns, CRM integrations), a 10-user minimum and tiered USD billing; a Canada hosting region exists but is not the default configuration. Fits an organization managing multiple international brands with complex CRM integrations. See the ATOM vs Exclaimer comparison.
  • Signitic. A French platform with a free plan for up to 19 users (Signitic branding visible in the signature), then a paid tier starting at €1 per user per month with a 20-license minimum; 100% European hosting. Fits a small European team for whom entry price outweighs data residency. See the ATOM vs Signitic comparison.
  • WiseStamp. A New York-based platform deployable client-side (Outlook add-in, Chrome extension), server-side or hybrid, with an AI designer, banner campaigns and tiers (Basic, Grow, Platform, Enterprise) billed from $19 per month plus $1 per employee per month. Suits a multi-brand organization, or one also on Google Workspace, that values SOC 2 Type II and ISO 27001 certifications and for which Canadian hosting is not a requirement. See ATOM vs WiseStamp.
  • Rocketseed. A vendor whose offer relies solely on server-side deployment (Microsoft 365, Google Workspace, Exchange), with no add-in to install, a public price grid starting at 50 employees, a one-time setup fee and 24/7 support with a dedicated account manager. Suits an organization of 50 employees or more that wants a turnkey setup and accepts that its outgoing email goes through the vendor's service. See ATOM vs Rocketseed.
  • Opensense. A San Francisco platform deployable server-side, through an Outlook add-in or via the Gmail API, with banners, email tracking and integrations (directory, HR, CRM), priced from $1 to $5 per user per month with a $500 monthly minimum; data hosted in the United States by default, optional residency in Europe, Asia or Australia, SOC 2 Type II attestation. Suits a large organization that can absorb the monthly minimum, wants to link signature, email tracking and CRM, and for which US hosting is acceptable. See ATOM vs Opensense.
  • Terminus. Email signature marketing (Sigstr) built into an account-based marketing (ABM) platform, with banners that are dynamic by sender, recipient and lifecycle stage; Terminus merged into DemandScience in November 2024 and its signature product pages now redirect to DemandScience's site, with no public price. Suits a B2B marketing team that mainly wants an advertising channel in its employees' emails; confirm with the vendor that the offer is still sold on its own. See ATOM vs Terminus.
  • Microsoft 365's native signature and Exchange transport rules. Free and already included in your subscription, but with known limits: unreliable images, no signature in Sent Items with the transport rule, no fine-grained targeting by group. Fits a team that only needs a static signature, with no logo or targeting. See the native signature vs ATOM comparison and the guide on the Exchange transport rule.

For an overview of every alternative on the market, see the Alternatives page.

Switching from Letsignit to ATOM, step by step

Here is how to switch from Letsignit to ATOM, with no email disruption and no duplicate signature:

  1. Take stock of the signature templates and targeting rules used in Letsignit.
  2. Connect the Microsoft 365 tenant to ATOM: admin consent, read-only access to the directory.
  3. Recreate the signatures in the ATOM editor with "Import HTML", then replace Letsignit's dynamic fields with ATOM tokens (name, title, phone…).
  4. Reproduce the targeting by Microsoft 365 groups, users or shared mailboxes.
  5. Deploy the ATOM add-in from the Microsoft 365 admin center, using the manifest URL generated in the Connections tab; allow up to 24 hours for propagation.
  6. Remove Letsignit at cutover: uninstall its add-in and, if you used its server-side SMTP connector, delete that connector and the transport rule it created in Exchange Online, per Letsignit's documentation.
  7. Check the rendering on a few accounts (web, desktop, mobile) before cancelling Letsignit.

The detail of each step (permissions, targeting, deployment) is covered in our documentation and our guide on deploying a signature organization-wide.

What does leaving Letsignit cost you?

Letsignit remains a feature-rich product; leaving has a real cost, worth acknowledging honestly:

  • Banners, campaigns, vCards and presentations (Slides) managed centrally — Letsignit's marketing suite goes well beyond a simple signature.
  • Multiple deployment methods beyond the Outlook add-in: an API for Outlook on the Web, an app for Outlook Windows, a server-side SMTP connector for scenarios the add-in alone does not cover.
  • ISO 27001 and ISO 27018 certifications, backed by regular penetration testing.

ATOM does not replace these features: the platform applies the signature, hosted in Canada, without PowerPoint presentation management — you still get A/B banner campaigns and click statistics, plus the vCard (an “Add to my contacts” button) and QR code in the signature, all included at no extra charge.

Comparing Letsignit and ATOM in detail

This guide does not repeat the full comparison table, now reserved for the technical head-to-head. For a criterion-by-criterion review — hosting, architecture, pricing, features — see ATOM vs Letsignit.

Frequently asked questions

Can we bring our Letsignit templates into ATOM?

Yes. The ATOM editor offers "Import HTML" to paste your Letsignit template code directly, then replace its dynamic fields with ATOM tokens (name, title, phone, etc.). Targeting by group, user or shared mailbox is then recreated in the console.

Do we need to remove Letsignit before installing ATOM?

You can install the ATOM add-in before removing Letsignit, but keep both active only long enough to check the rendering: otherwise, some messages would show two signatures. At cutover, uninstall the Letsignit add-in and, if you used its SMTP connector, delete it along with the associated transport rule in Exchange Online.

How long does the switch take?

It mostly depends on the number of templates and targeting rules to reproduce. The only documented technical constraint is Microsoft's: up to 24 hours for propagation after deploying the add-in from the Microsoft 365 admin center.

What other alternatives to Letsignit exist?

Beyond ATOM, organizations also evaluate CodeTwo, Exclaimer or Signitic, as well as Microsoft 365's native signature (local Outlook signature or Exchange transport rule). See the "Alternatives to Letsignit" section above for details on each.

Switch from Letsignit with no duplicate signature. ATOM Signatures reuses your templates and targeting, and applies the signature client-side, hosted in Canada, for CAD $1 per user.

Discover ATOM Signatures

The product in detail: Office 365 email signature management with ATOM.

Sources

This comparison is provided for information purposes; the prices, plans and hosting regions cited may change — always verify the official sources. ATOM Solutions is not affiliated with Letsignit, CodeTwo, Exclaimer or Signitic. This article does not constitute legal advice.