Barracuda mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 12, 2026), Barracuda is the mailbox provider for 3,369 domains — 0.51% of 665,310 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 3,369 domains in the Tranco top-1M use Barracuda (0.51% of domains with MX records).
- Snapshot date: 2026-09-12 — recomputed every day.
- 30-day share change: -0.01 pp.
- Strongest TLD: .com (49.7% of its domains).
- Region skew: Global / US-skewed.
- Most co-used service: Barracuda Essentials.
- Directory category: email security gateway.
Why Barracuda appears in this category
Mid-market email security and backup.
We classify it as a email security gateway from primary MX record (lowest preference) matching a maintained provider rule. This is infrastructure attribution from public DNS, not evidence of a direct contract or exclusive use.
Barracuda is an email security and archiving platform operated by Barracuda Networks, functioning as an MX handler and email gateway. Organisations deploy it to shield their inboxes with managed filtering, compliance, and threat prevention.
The platform's MX footprint appears mostly in smaller and mid-market organisations rather than the largest brands, concentrates in the .com namespace, and shows global distribution with US emphasis. Senders targeting these inboxes encounter both the Barracuda infrastructure and, often, Barracuda Essentials security filters; deliverability hinges on alignment with Barracuda's threat models and the recipient's security policies.
Where Barracuda sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 2 | 0.1% |
| Top 10,000 | 18 | 0.5% |
| Top 100,000 | 279 | 8.3% |
| Top 1,000,000 | 3,041 | 90.3% |
| Unranked | 29 | 0.9% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 1,673 | 49.7% | |
| .org | 523 | 15.5% | |
| .edu | 137 | 4.1% | |
| .co.uk | 132 | 3.9% | |
| .gov | 108 | 3.2% | |
| .net | 96 | 2.8% | |
| .nl | 69 | 2.0% | |
| .ca | 49 | 1.5% | |
| .de | 46 | 1.4% | |
| .it | 38 | 1.1% |
What Barracuda users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 3,369 domains.
| Type | Service | Domains | Share of Barracuda users |
|---|---|---|---|
| ESP | Barracuda Essentials | 1,685 | 50.0% |
| ESP | Amazon SES | 351 | 10.4% |
| ESP | SendGrid (Twilio) | 336 | 10.0% |
| ESP | Salesforce | 297 | 8.8% |
| ESP | HubSpot | 287 | 8.5% |
| ESP | Mailchimp | 284 | 8.4% |
| ESP | Barracuda Email Security | 284 | 8.4% |
| ESP | Mandrill | 247 | 7.3% |
| ESP | Mailgun | 217 | 6.4% |
| ESP | Zendesk | 161 | 4.8% |
Barracuda Essentials filtering layer
Barracuda Essentials, the security product often deployed with Barracuda's email platform, applies real-time filtering to incoming mail based on threat scoring, sender reputation, and policy rules. Organisations using Barracuda Essentials retain granular control over filter aggressiveness and can configure allowlists, blocklists, and custom policies. Senders experiencing delivery issues should verify their authentication posture (SPF, DKIM, DMARC), review blocklist status, and confirm their sending patterns do not trigger Barracuda's heuristic detections.
See the full Barracuda data page (KPI cards, trend, sample domains) →
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Frequently asked questions
If my emails are rejected by Barracuda, what should I check?
First verify your authentication records (SPF, DKIM, DMARC) are correct and your sender reputation is clean. Barracuda Essentials filters based on threat scoring and policy rules; rejections typically indicate authentication issues, blocklist presence, or policy mismatch.
How many domains use Barracuda?
3,369 domains in the Tranco top-1M use Barracuda as their mailbox provider as of September 12, 2026 (0.51% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is Barracuda common enough to affect email deliverability testing?
Barracuda accounts for 0.51% of domains with MX records in the top 1M. Whether you should seed a test mailbox there depends on how much of your audience it represents — the co-usage table above shows the services it appears alongside most.
Is Barracuda growing or declining?
Barracuda is declining — its share moved -0.01 pp over the last 30 days (as of September 12, 2026).
Which countries or TLDs use Barracuda most?
Barracuda's largest TLD is .com (49.7% of its domains); it appears across 115 TLDs in total.