KnowBe4 email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 14, 2026), KnowBe4 is the SaaS sender for 3,406 domains — 0.53% of 637,677 SPF-publishing domains. Over the last 30 days its share declined by 0.02 pp, and -0.05 pp year-over-year. Its strongest TLD is .com (55.6% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-09-14 DNS snapshot.
What KnowBe4 represents in this dataset
KnowBe4 — security awareness training and simulated phishing platform, the largest vendor in that category.
Directory category: Saas. The classification comes from include: mechanisms in the SPF record. It describes observed DNS infrastructure, not a commercial relationship and not the placement of any individual message.
What the 2026-09-14 snapshot shows about KnowBe4
Across 153 distinct TLDs its top three are .com (55.6%), .org (11.7%), .edu (4.3%) — together 71.6% of the 3,406 domains, which makes the footprint narrow — three TLDs cover most of it, which is typical of a regional or single-market operator. The service most often observed on the same domains is Microsoft 365 (Mailbox, 1,894 domains, 55.6% of them), followed by Google Workspace (14.3%). Its share of SPF-publishing domains moved -0.02 pp in 30 days — inside the daily noise of list rotation. Directly comparable by the same detection rule: Shopify, Pardot (Salesforce), CodeTwo Email Signatures 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 (2026-09-14); a domain appears here when its published records match the include: mechanisms in the SPF record rule, which is an infrastructure fact, not a commercial relationship.
Commonly used together with KnowBe4
What else the same 3,406 domains use — cross-tabulated from the same daily snapshot (2026-09-14).
| Type | Service | Domains | Share of KnowBe4 users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 1,894 | 55.6% |
| Mailbox | Google Workspace | 486 | 14.3% |
| Mailbox | Mimecast | 272 | 8.0% |
| Mailbox | Proofpoint | 146 | 4.3% |
| Mailbox | Unknown / Other | 119 | 3.5% |
| Mailbox | Barracuda | 116 | 3.4% |
TLD distribution (top 30 of 153)
Frequently asked questions
How many domains use KnowBe4?
3,406 domains in the Tranco top-1M use KnowBe4 as their SaaS sender as of September 14, 2026, according to Live Direct Marketing's daily DNS scan.
What is KnowBe4's market share?
KnowBe4 holds 0.53% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-09-14). The number is recomputed every day.
Is KnowBe4 growing or declining?
KnowBe4's share declined by 0.02 percentage points over the last 30 days (as of September 14, 2026).
What are the biggest alternatives to KnowBe4?
The largest SaaS senders in the same category by Tranco top-1M share are: Shopify, Pardot (Salesforce), CodeTwo Email Signatures 365, Statuspage (Atlassian), Trustpilot (as of 2026-09-14).
Largest SaaS senders in this category
Shopify (0.86%) · Pardot (Salesforce) (0.74%) · CodeTwo Email Signatures 365 (0.70%) · Statuspage (Atlassian) (0.32%) · Trustpilot (0.29%) · Firebase (Google) (0.29%) · BigCommerce (0.28%) · Atlassian (Jira/Confluence) (0.28%) · Lark / Feishu (0.20%) · Sage Intacct (0.18%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 3,406 domains.