Bullhorn email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 24, 2026), Bullhorn is the email service provider (ESP) for 103 domains — 0.02% of 637,420 SPF-publishing domains. Its strongest TLD is .com (76.7% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-09-24 DNS snapshot.
What Bullhorn represents in this dataset
Bullhorn — recruitment CRM with built-in email.
Directory category: Esp. 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 2026-09-24 snapshot shows about Bullhorn
Across 18 distinct TLDs its top three are .com (76.7%), .co.uk (4.9%), .nl (1.9%) — together 83.5% of the 103 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, 59 domains, 57.3% of them), followed by Mimecast (14.6%). Directly comparable by the same detection rule: Amazon SES, SendGrid (Twilio), Mailgun. Ranking between them reflects what is published in DNS, not delivery quality or volume sent. All figures come from a single daily DNS snapshot (2026-09-24); 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 Bullhorn
What else the same 103 domains use — cross-tabulated from the same daily snapshot (2026-09-24).
| Type | Service | Domains | Share of Bullhorn users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 59 | 57.3% |
| Mailbox | Mimecast | 15 | 14.6% |
| Mailbox | Google Workspace | 14 | 13.6% |
| Mailbox | Proofpoint | 7 | 6.8% |
| Mailbox | Cisco IronPort | 3 | 2.9% |
| Mailbox | Proofpoint Essentials | 2 | 1.9% |
| ESP | HubSpot | 44 | 42.7% |
| ESP | Salesforce | 27 | 26.2% |
| ESP | SendGrid (Twilio) | 21 | 20.4% |
| ESP | Amazon SES | 15 | 14.6% |
TLD distribution (top 18 of 18)
Frequently asked questions
How many domains use Bullhorn?
103 domains in the Tranco top-1M use Bullhorn as their email service provider (ESP) as of September 24, 2026, according to Live Direct Marketing's daily DNS scan.
What is Bullhorn's market share?
Bullhorn holds 0.02% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-09-24). The number is recomputed every day.
What are the biggest alternatives to Bullhorn?
The largest email service provider (ESP)s in the same category by Tranco top-1M share are: Amazon SES, SendGrid (Twilio), Mailgun, Zendesk, Mailchimp (as of 2026-09-24).
Largest email service provider (ESP)s in this category
Amazon SES (6.23%) · SendGrid (Twilio) (4.68%) · Mailgun (4.01%) · Zendesk (3.77%) · Mailchimp (3.61%) · Mandrill (3.26%) · HubSpot (3.18%) · Salesforce (2.57%) · Mailjet (Sinch) (2.14%) · Cloudflare Email Routing (1.96%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 103 domains.