Cal.com email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 5, 2026), Cal.com is the SaaS sender for 98 domains — 0.02% of 633,359 SPF-publishing domains. Its strongest TLD is .com (74.5% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-09-05 DNS snapshot.
What Cal.com represents in this dataset
Cal.com is classified from its observed role in public email DNS records.
Directory category: Unknown. 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 2026-09-05 snapshot shows about Cal.com
Across 17 distinct TLDs its top three are .com (74.5%), .org (5.1%), .com.br (4.1%) — together 83.7% of the 98 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, 42 domains, 42.9% of them), followed by Google Workspace (21.4%). 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 (2026-09-05); 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 Cal.com
What else the same 98 domains use — cross-tabulated from the same daily snapshot (2026-09-05).
| Type | Service | Domains | Share of Cal.com users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 42 | 42.9% |
| Mailbox | Google Workspace | 21 | 21.4% |
| Mailbox | Self-Hosted | 8 | 8.2% |
| Mailbox | Generic / unmatched (mx*.*) | 5 | 5.1% |
| Mailbox | Proofpoint | 5 | 5.1% |
| Mailbox | Mimecast | 4 | 4.1% |
TLD distribution (top 17 of 17)
Frequently asked questions
How many domains use Cal.com?
98 domains in the Tranco top-1M use Cal.com as their SaaS sender as of September 5, 2026, according to Live Direct Marketing's daily DNS scan.
What is Cal.com's market share?
Cal.com holds 0.02% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-09-05). The number is recomputed every day.
What are the biggest alternatives to Cal.com?
The largest SaaS senders in the same category by Tranco top-1M share are: Shopify, Pardot (Salesforce), CodeTwo Email Signatures 365, KnowBe4, Statuspage (Atlassian) (as of 2026-09-05).
Largest SaaS senders in this category
Shopify (0.86%) · Pardot (Salesforce) (0.74%) · CodeTwo Email Signatures 365 (0.70%) · KnowBe4 (0.53%) · Statuspage (Atlassian) (0.32%) · BigCommerce (0.29%) · Trustpilot (0.29%) · Firebase (Google) (0.29%) · Atlassian (Jira/Confluence) (0.28%) · Lark / Feishu (0.20%)
Domain sample (top 98 by Tranco rank)
Showing 98 of 98 domains.