According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Barracuda is the mailbox provider for 3,489 domains — 0.53% of 658,711 domains with MX records. Detection method: primary MX record (lowest preference).
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.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 2 | 0.1% |
| Top 10,000 | 17 | 0.5% |
| Top 100,000 | 279 | 8.0% |
| Top 1,000,000 | 2,810 | 80.5% |
| Unranked | 381 | 10.9% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 1,705 | 48.9% | |
| .org | 581 | 16.7% | |
| .edu | 149 | 4.3% | |
| .co.uk | 123 | 3.5% | |
| .gov | 114 | 3.3% | |
| .net | 105 | 3.0% | |
| .nl | 74 | 2.1% | |
| .ca | 47 | 1.3% | |
| .de | 46 | 1.3% | |
| .it | 37 | 1.1% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 3,489 domains.
| Type | Service | Domains | Share of Barracuda users |
|---|---|---|---|
| ESP | Barracuda Essentials | 1,756 | 50.3% |
| ESP | SendGrid (Twilio) | 353 | 10.1% |
| ESP | Amazon SES | 353 | 10.1% |
| ESP | Salesforce | 309 | 8.9% |
| ESP | Mailchimp | 296 | 8.5% |
| ESP | Barracuda Email Security | 288 | 8.3% |
| ESP | HubSpot | 277 | 7.9% |
| ESP | Mandrill | 266 | 7.6% |
| ESP | Mailgun | 228 | 6.5% |
| ESP | Zendesk | 175 | 5.0% |
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) →
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.
3,489 domains in the Tranco top-1M use Barracuda as their mailbox provider as of July 13, 2026 (0.53% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Barracuda accounts for 0.53% 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.
Barracuda is growing — its share moved +0.01 pp over the last 30 days (as of July 13, 2026).
Barracuda's largest TLD is .com (48.9% of its domains); it appears across 115 TLDs in total.