Cisco IronPort email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 13, 2026), Cisco IronPort is the mailbox provider for 2,499 domains — 0.38% of 664,797 domains with MX records. Its share has been stable over the last 30 days. Its strongest TLD is .com (47.3% of its domains). Detection: primary MX record (lowest preference).
Last updated from the 2026-09-13 DNS snapshot.
What Cisco IronPort represents in this dataset
Cisco Secure Email (formerly IronPort).
Directory category: Gateway. The classification comes from primary MX record (lowest preference). It describes observed DNS infrastructure, not a commercial relationship and not the placement of any individual message.
What the 2026-09-13 snapshot shows about Cisco IronPort
Across 129 distinct TLDs its top three are .com (47.3%), .org (7.1%), .edu (3.3%) — together 57.7% of the 2,499 domains, which makes the footprint moderately concentrated, with a recognisable home market. The service most often observed on the same domains is Salesforce (ESP, 238 domains, 9.5% of them), followed by Amazon SES (7.9%). Its share of domains with MX records has not moved measurably in 30 days. Directly comparable by the same detection rule: Self-Hosted, Google Workspace, Microsoft 365. Ranking between them reflects what is published in DNS, not delivery quality or volume sent. All figures come from a single daily DNS snapshot (2026-09-13); a domain appears here when its published records match the primary MX record (lowest preference) rule, which is an infrastructure fact, not a commercial relationship.
Commonly used together with Cisco IronPort
What else the same 2,499 domains use — cross-tabulated from the same daily snapshot (2026-09-13).
| Type | Service | Domains | Share of Cisco IronPort users |
|---|---|---|---|
| ESP | Salesforce | 238 | 9.5% |
| ESP | Amazon SES | 197 | 7.9% |
| ESP | SendGrid (Twilio) | 151 | 6.0% |
| ESP | Mandrill | 113 | 4.5% |
| ESP | Mailgun | 107 | 4.3% |
| ESP | Zendesk | 107 | 4.3% |
| ESP | HubSpot | 103 | 4.1% |
| ESP | Mailchimp | 92 | 3.7% |
| ESP | Marketo (Adobe) | 73 | 2.9% |
| ESP | Mailjet (Sinch) | 71 | 2.8% |
TLD distribution (top 30 of 129)
Frequently asked questions
How many domains use Cisco IronPort?
2,499 domains in the Tranco top-1M use Cisco IronPort as their mailbox provider as of September 13, 2026, according to Live Direct Marketing's daily DNS scan.
What is Cisco IronPort's market share?
Cisco IronPort holds 0.38% of domains with MX records in the Tranco top-1M (snapshot of 2026-09-13). The number is recomputed every day.
Is Cisco IronPort growing or declining?
Cisco IronPort's share has been stable over the last 30 days (±0.01 pp).
What are the biggest alternatives to Cisco IronPort?
The largest mailbox providers in the same category by Tranco top-1M share are: Self-Hosted, Google Workspace, Microsoft 365, Unknown / Other, Generic / unmatched (mx*.*) (as of 2026-09-13).
Largest mailbox providers in this category
Self-Hosted (22.38%) · Google Workspace (21.67%) · Microsoft 365 (16.97%) · Unknown / Other (6.61%) · Generic / unmatched (mx*.*) (2.53%) · Generic / unmatched (mail.*) (1.94%) · Proofpoint (1.88%) · Cloudflare Email Routing (1.75%) · Yandex 360 (1.61%) · Mimecast (1.46%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 2,499 domains.