Krystal Hosting (UK) mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 14, 2026), Krystal Hosting (UK) is the mailbox provider for 190 domains — 0.03% of 674,487 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 190 domains in the Tranco top-1M use Krystal Hosting (UK) (0.03% of domains with MX records).
- Snapshot date: 2026-09-14 — recomputed every day.
- Strongest TLD: .co.uk (40.5% of its domains).
- Region skew: United Kingdom.
- Most co-used service: Mailchimp.
- Directory category: hosting mail bundle.
Why Krystal Hosting (UK) appears in this category
UK independent green-energy hosting; "Onyx" cPanel platform.
We classify it as a hosting mail bundle 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.
Krystal Hosting (UK) is a hosting and email services provider based in the United Kingdom, offering mailbox services alongside domain registration and web hosting infrastructure. It serves a distributed customer base across multiple international domains, with particular concentration in the .co.uk namespace.
The provider sits predominantly in the long tail of smaller and regional sites rather than the largest enterprises. For senders targeting UK small-business email, or anyone assessing email reception across a broad spectrum of mailbox providers, Krystal Hosting represents an important but often overlooked recipient base—not the high-volume mega-providers, but a steady presence that warrants consideration in testing strategies.
Where Krystal Hosting (UK) sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 1 | 0.5% |
| Top 100,000 | 5 | 2.6% |
| Top 1,000,000 | 183 | 96.3% |
| Unranked | 1 | 0.5% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .co.uk | 77 | 40.5% | |
| .com | 47 | 24.7% | |
| .org.uk | 19 | 10.0% | |
| .net | 15 | 7.9% | |
| .org | 13 | 6.8% | |
| .uk | 3 | 1.6% | |
| .tv | 2 | 1.1% | |
| .ie | 2 | 1.1% | |
| .info | 2 | 1.1% | |
| .fr | 2 | 1.1% |
What Krystal Hosting (UK) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 190 domains.
| Type | Service | Domains | Share of Krystal Hosting (UK) users |
|---|---|---|---|
| ESP | Mailchimp | 5 | 2.6% |
| ESP | MailerLite | 4 | 2.1% |
| ESP | Mailgun | 3 | 1.6% |
| ESP | SendGrid (Twilio) | 2 | 1.1% |
| ESP | Mailjet (Sinch) | 2 | 1.1% |
| ESP | SenderSRV | 2 | 1.1% |
| ESP | Mandrill | 1 | 0.5% |
| ESP | Elastic Email | 1 | 0.5% |
| ESP | Zoho Campaigns | 1 | 0.5% |
| ESP | Brevo (ex-Sendinblue) | 1 | 0.5% |
Regional concentration and testing implications
Krystal Hosting's customer base is heavily skewed toward the United Kingdom and .co.uk domains, making it relevant for campaigns targeting UK-based recipients or small regional businesses. Unlike the globally distributed megaproviders, its regional focus creates a distinct receiving environment. Senders conducting regional or vertical-specific testing should include Krystal in their provider mix to surface reception issues that might be invisible when testing only against larger, global platforms.
See the full Krystal Hosting (UK) data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should I test email deliverability against Krystal Hosting?
If your recipient base includes UK small businesses, regional enterprises, or <code>.co.uk</code> domains, Krystal Hosting is worth including in your testing rotation. Because it sits in the long tail rather than the mainstream, reception problems there may be invisible to broader testing strategies.
How many domains use Krystal Hosting (UK)?
190 domains in the Tranco top-1M use Krystal Hosting (UK) as their mailbox provider as of September 14, 2026 (0.03% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is Krystal Hosting (UK) common enough to affect email deliverability testing?
Krystal Hosting (UK) accounts for 0.03% 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.
Which countries or TLDs use Krystal Hosting (UK) most?
Krystal Hosting (UK)'s largest TLD is .co.uk (40.5% of its domains); it appears across 18 TLDs in total.