mailbox
According to Live Direct Marketing's daily Tranco top-1M scan (July 26, 2026), Cisco IronPort is the mailbox provider for 2,621 domains — 0.39% of 667,887 domains with MX records. Over the last 30 days its share declined by 0.03 pp. Its strongest TLD is .com (47.4% of its domains). Detection: primary MX record (lowest preference).
Last updated from the 2026-07-26 DNS snapshot.
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.
Across 131 distinct TLDs its top three are .com (47.4%), .org (6.6%), .edu (3.3%) — together 57.3% of the 2,621 domains, which makes the footprint moderately concentrated, with a recognisable home market. The service most often observed on the same domains is Salesforce (ESP, 244 domains, 9.3% of them), followed by Amazon SES (7.7%). Its share of domains with MX records moved -0.03 pp in 30 days — inside the daily noise of list rotation. 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 (2026-07-26); 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.
What else the same 2,621 domains use — cross-tabulated from the same daily snapshot (2026-07-26).
| Type | Service | Domains | Share of Cisco IronPort users |
|---|---|---|---|
| ESP | Salesforce | 244 | 9.3% |
| ESP | Amazon SES | 201 | 7.7% |
| ESP | SendGrid (Twilio) | 155 | 5.9% |
| ESP | Mandrill | 121 | 4.6% |
| ESP | Zendesk | 108 | 4.1% |
| ESP | Mailgun | 108 | 4.1% |
| ESP | HubSpot | 103 | 3.9% |
| ESP | Mailchimp | 97 | 3.7% |
| ESP | Mailjet (Sinch) | 74 | 2.8% |
| ESP | Marketo (Adobe) | 73 | 2.8% |
2,621 domains in the Tranco top-1M use Cisco IronPort as their mailbox provider as of July 26, 2026, according to Live Direct Marketing's daily DNS scan.
Cisco IronPort holds 0.39% of domains with MX records in the Tranco top-1M (snapshot of 2026-07-26). The number is recomputed every day.
Cisco IronPort's share declined by 0.03 percentage points over the last 30 days (as of July 26, 2026).
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 2026-07-26).
Self-Hosted (22.75%) · Google Workspace (21.84%) · Microsoft 365 (16.92%) · Unknown / Other (6.80%) · Generic / unmatched (mx*.*) (2.54%) · Proofpoint (1.92%) · Generic / unmatched (mail.*) (1.77%) · Yandex 360 (1.68%) · Cloudflare Email Routing (1.63%) · Mimecast (1.53%)
Showing 100 of 2,621 domains.