esp
According to Live Direct Marketing's daily Tranco top-1M scan (July 26, 2026), Barracuda Essentials is the email service provider (ESP) for 2,219 domains — 0.35% of 630,738 SPF-publishing domains. Its strongest TLD is .com (54.6% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-07-26 DNS snapshot.
Barracuda Essentials cloud email security gateway.
Directory category: Gateway. 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.
Across 81 distinct TLDs its top three are .com (54.6%), .org (18.4%), .gov (4.4%) — together 77.5% of the 2,219 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 Barracuda (Mailbox, 1,810 domains, 81.6% of them), followed by Microsoft 365 (11.6%). 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 (2026-07-26); 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.
What else the same 2,219 domains use — cross-tabulated from the same daily snapshot (2026-07-26).
| Type | Service | Domains | Share of Barracuda Essentials users |
|---|---|---|---|
| Mailbox | Barracuda | 1,810 | 81.6% |
| Mailbox | Microsoft 365 | 258 | 11.6% |
| Mailbox | Mimecast | 25 | 1.1% |
| Mailbox | Proofpoint | 23 | 1.0% |
| Mailbox | Google Workspace | 22 | 1.0% |
| Mailbox | Unknown / Other | 18 | 0.8% |
| ESP | SendGrid (Twilio) | 257 | 11.6% |
| ESP | Amazon SES | 249 | 11.2% |
| ESP | Salesforce | 221 | 10.0% |
| ESP | Mailchimp | 193 | 8.7% |
2,219 domains in the Tranco top-1M use Barracuda Essentials as their email service provider (ESP) as of July 26, 2026, according to Live Direct Marketing's daily DNS scan.
Barracuda Essentials holds 0.35% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-07-26). The number is recomputed every day.
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 2026-07-26).
Amazon SES (6.17%) · SendGrid (Twilio) (4.76%) · Mailgun (4.11%) · Zendesk (3.83%) · Mailchimp (3.70%) · Mandrill (3.36%) · HubSpot (3.19%) · Salesforce (2.62%) · Mailjet (Sinch) (2.13%) · Cloudflare Email Routing (1.82%)
Showing 100 of 2,219 domains.