Barracuda Email Security email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 14, 2026), Barracuda Email Security is the email service provider (ESP) for 347 domains — 0.05% of 637,677 SPF-publishing domains. Its strongest TLD is .com (34.3% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-09-14 DNS snapshot.
What Barracuda Email Security represents in this dataset
Barracuda Email Security Service (UK PoP).
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.
What the 2026-09-14 snapshot shows about Barracuda Email Security
Across 35 distinct TLDs its top three are .com (34.3%), .co.uk (29.4%), .org.uk (7.8%) — together 71.5% of the 347 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, 287 domains, 82.7% of them), followed by Microsoft 365 (10.7%). 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 (2026-09-14); 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 Barracuda Email Security
What else the same 347 domains use — cross-tabulated from the same daily snapshot (2026-09-14).
| Type | Service | Domains | Share of Barracuda Email Security users |
|---|---|---|---|
| Mailbox | Barracuda | 287 | 82.7% |
| Mailbox | Microsoft 365 | 37 | 10.7% |
| Mailbox | EmailSecurity.app gateway | 6 | 1.7% |
| Mailbox | Mimecast | 5 | 1.4% |
| Mailbox | Google Workspace | 2 | 0.6% |
| Mailbox | Proofpoint | 2 | 0.6% |
| ESP | Mailchimp | 50 | 14.4% |
| ESP | SendGrid (Twilio) | 47 | 13.5% |
| ESP | Amazon SES | 46 | 13.3% |
| ESP | Mandrill | 40 | 11.5% |
TLD distribution (top 30 of 35)
Frequently asked questions
How many domains use Barracuda Email Security?
347 domains in the Tranco top-1M use Barracuda Email Security as their email service provider (ESP) as of September 14, 2026, according to Live Direct Marketing's daily DNS scan.
What is Barracuda Email Security's market share?
Barracuda Email Security holds 0.05% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-09-14). The number is recomputed every day.
What are the biggest alternatives to Barracuda Email Security?
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 2026-09-14).
Largest email service provider (ESP)s in this category
Amazon SES (6.16%) · SendGrid (Twilio) (4.62%) · Mailgun (4.00%) · Zendesk (3.75%) · Mailchimp (3.57%) · Mandrill (3.24%) · HubSpot (3.11%) · Salesforce (2.54%) · Mailjet (Sinch) (2.12%) · Cloudflare Email Routing (1.95%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 347 domains.