Intercom email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 12, 2026), Intercom is the email service provider (ESP) for 556 domains — 0.09% of 629,828 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 556 domains in the Tranco top-1M use Intercom (0.09% of SPF-publishing domains).
- Snapshot date: 2026-09-12 — recomputed every day.
- Strongest TLD: .com (69.8% of its domains).
- Most co-used service: Google Workspace.
- Directory category: email service provider.
Why Intercom appears in this category
Customer messaging platform — transactional + lifecycle email.
We classify it as a email service provider from include: mechanisms in the SPF record matching a maintained provider rule. This is infrastructure attribution from public DNS, not evidence of a direct contract or exclusive use.
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.
Where Intercom sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 1 | 0.2% |
| Top 10,000 | 15 | 2.7% |
| Top 100,000 | 138 | 24.8% |
| Top 1,000,000 | 400 | 71.9% |
| Unranked | 2 | 0.4% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 388 | 69.8% | |
| .io | 53 | 9.5% | |
| .co | 18 | 3.2% | |
| .net | 10 | 1.8% | |
| .co.uk | 9 | 1.6% | |
| .de | 7 | 1.3% | |
| .ai | 7 | 1.3% | |
| .org | 7 | 1.3% | |
| .app | 5 | 0.9% | |
| .com.br | 5 | 0.9% |
What Intercom users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 556 domains.
| Type | Service | Domains | Share of Intercom users |
|---|---|---|---|
| Mailbox | Google Workspace | 450 | 80.9% |
| Mailbox | Microsoft 365 | 58 | 10.4% |
| Mailbox | Self-Hosted | 9 | 1.6% |
| Mailbox | Proofpoint | 7 | 1.3% |
| Mailbox | Unknown / Other | 5 | 0.9% |
| Mailbox | Mimecast | 4 | 0.7% |
| ESP | Mandrill | 156 | 28.1% |
| ESP | HubSpot | 144 | 25.9% |
| ESP | SendGrid (Twilio) | 140 | 25.2% |
| ESP | Mailchimp | 121 | 21.8% |
SPF record complexity and third-party sender management
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) →
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Frequently asked questions
Is Intercom a major mailbox provider I should test deliverability against?
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.
How many domains use Intercom?
556 domains in the Tranco top-1M use Intercom as their email service provider (ESP) as of September 12, 2026 (0.09% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Intercom common enough to affect email deliverability testing?
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.
Which countries or TLDs use Intercom most?
Intercom's largest TLD is .com (69.8% of its domains); it appears across 44 TLDs in total.