Cisco IronPort mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 12, 2026), Cisco IronPort is the mailbox provider for 2,501 domains — 0.38% of 665,310 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 2,501 domains in the Tranco top-1M use Cisco IronPort (0.38% of domains with MX records).
- Snapshot date: 2026-09-12 — recomputed every day.
- 30-day share change: -0.01 pp.
- Strongest TLD: .com (47.2% of its domains).
- Region skew: Global / US-skewed.
- Most co-used service: Salesforce.
- Directory category: email security gateway.
Why Cisco IronPort appears in this category
Cisco Secure Email (formerly IronPort).
We classify it as a email security gateway from primary MX record (lowest preference) matching a maintained provider rule. This is infrastructure attribution from public DNS, not evidence of a direct contract or exclusive use.
Cisco IronPort is a commercial email gateway and message filtering platform operated by Cisco. It provides organisations with email security, phishing and spam filtering, and message routing capabilities, typically deployed as an on-premises or cloud-hosted email gateway.
IronPort's footprint skews toward the long tail of mid-market and smaller organisations rather than the largest enterprise brands, with particular concentration in the .com domain space and a global-to-US regional weighting. The platform is frequently encountered alongside Salesforce deployments, though its overall market share has been declining in recent years. For email senders and infrastructure operators, this means IronPort is a secondary rather than primary reputation and testing priority, but remains relevant for campaigns targeting specific verticals and organisation sizes.
Where Cisco IronPort sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 14 | 0.6% |
| Top 10,000 | 63 | 2.5% |
| Top 100,000 | 416 | 16.6% |
| Top 1,000,000 | 1,998 | 79.9% |
| Unranked | 10 | 0.4% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 1,181 | 47.2% | |
| .org | 178 | 7.1% | |
| .edu | 83 | 3.3% | |
| .de | 76 | 3.0% | |
| .fr | 58 | 2.3% | |
| .gov | 56 | 2.2% | |
| .net | 54 | 2.2% | |
| .ca | 50 | 2.0% | |
| .it | 49 | 2.0% | |
| .co.il | 48 | 1.9% |
What Cisco IronPort users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 2,501 domains.
| Type | Service | Domains | Share of Cisco IronPort users |
|---|---|---|---|
| ESP | Salesforce | 238 | 9.5% |
| ESP | Amazon SES | 197 | 7.9% |
| ESP | SendGrid (Twilio) | 152 | 6.1% |
| ESP | Mandrill | 113 | 4.5% |
| ESP | Mailgun | 107 | 4.3% |
| ESP | Zendesk | 107 | 4.3% |
| ESP | HubSpot | 102 | 4.1% |
| ESP | Mailchimp | 92 | 3.7% |
| ESP | Marketo (Adobe) | 72 | 2.9% |
| ESP | Mailjet (Sinch) | 71 | 2.8% |
IronPort in mid-market and Salesforce deployments
IronPort appears predominantly in Salesforce-integrated and mid-market organisations rather than tier-one properties. For senders targeting .com-based North American audiences within these segments, understanding IronPort's filtering behaviour and authentication stance can improve delivery; however, test more prevalent gateways first and include IronPort only if your audience profile specifically matches these deployment patterns.
See the full Cisco IronPort data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should I test email deliverability against Cisco IronPort?
Test against IronPort if your audience includes Salesforce-integrated organisations or mid-market .com companies. It is not a primary testing priority because it occupies the long tail rather than the largest brands.
How many domains use Cisco IronPort?
2,501 domains in the Tranco top-1M use Cisco IronPort as their mailbox provider as of September 12, 2026 (0.38% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is Cisco IronPort common enough to affect email deliverability testing?
Cisco IronPort accounts for 0.38% of domains with MX records 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.
Is Cisco IronPort growing or declining?
Cisco IronPort is declining — its share moved -0.01 pp over the last 30 days (as of September 12, 2026).
Which countries or TLDs use Cisco IronPort most?
Cisco IronPort's largest TLD is .com (47.2% of its domains); it appears across 130 TLDs in total.