According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Intercom is the email service provider (ESP) for 581 domains — 0.09% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Intercom is a customer communications platform operated by Intercom Inc., providing organisations with email, chat, and messaging tools for customer engagement. When a domain configures Intercom to send mail on its behalf, Intercom appears in the domain's email authentication infrastructure—specifically as an authorised sender within the domain's SPF record.
Intercom's deployment footprint skews towards smaller and mid-market organisations rather than the largest brands, with notable concentration in the .com namespace. It frequently appears alongside Google Workspace in the same sending infrastructure, a pattern indicating adoption by organisations that use Google's cloud email internally whilst layering Intercom for transactional and outbound customer messaging.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 17 | 2.9% |
| Top 100,000 | 150 | 25.8% |
| Top 1,000,000 | 399 | 68.7% |
| Unranked | 15 | 2.6% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 403 | 69.4% | |
| .io | 57 | 9.8% | |
| .co | 18 | 3.1% | |
| .net | 12 | 2.1% | |
| .co.uk | 8 | 1.4% | |
| .de | 6 | 1.0% | |
| .org | 6 | 1.0% | |
| .ai | 5 | 0.9% | |
| .com.br | 5 | 0.9% | |
| .app | 4 | 0.7% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 581 domains.
| Type | Service | Domains | Share of Intercom users |
|---|---|---|---|
| Mailbox | Google Workspace | 469 | 80.7% |
| Mailbox | Microsoft 365 | 62 | 10.7% |
| Mailbox | Self-Hosted | 9 | 1.5% |
| Mailbox | Proofpoint | 7 | 1.2% |
| Mailbox | Unknown / Other | 5 | 0.9% |
| Mailbox | Mimecast | 4 | 0.7% |
| ESP | Mandrill | 166 | 28.6% |
| ESP | SendGrid (Twilio) | 149 | 25.6% |
| ESP | HubSpot | 147 | 25.3% |
| ESP | Mailchimp | 126 | 21.7% |
When Intercom sends on behalf of a domain, the domain's SPF record must explicitly authorise Intercom's mail servers, consuming part of the record's finite DNS-lookup budget. This creates a maintenance obligation: organisations must regularly audit their SPF records to remove deprecated third-party senders (including Intercom if it is no longer in use) and ensure active authorisations remain correct. Stale or misconfigured SPF entries increase the risk that legitimate Intercom-sourced messages will fail authentication checks at receiving systems and be filtered or rejected, making ongoing record hygiene essential for authentication integrity.
See the full Intercom data page (KPI cards, trend, sample domains) →
Intercom is a customer communications platform, not a mailbox provider; if you send through Intercom, focus testing on delivery to external recipients to verify authentication passes, rather than testing Intercom's own systems.
581 domains in the Tranco top-1M use Intercom as their email service provider (ESP) as of July 13, 2026 (0.09% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Intercom accounts for 0.09% of SPF-publishing domains in the top 1M. Whether you should seed a test mailbox there depends on how much of your audience it represents — the co-usage table above shows the services it appears alongside most.
Intercom's largest TLD is .com (69.4% of its domains); it appears across 50 TLDs in total.