Heart Internet (UK) mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 11, 2026), Heart Internet (UK) is the mailbox provider for 124 domains — 0.02% of 666,213 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 124 domains in the Tranco top-1M use Heart Internet (UK) (0.02% of domains with MX records).
- Snapshot date: 2026-09-11 — recomputed every day.
- Strongest TLD: .com (38.7% of its domains).
- Region skew: Global / US-skewed.
- Most co-used service: SendGrid (Twilio).
- Directory category: hosting mail bundle.
Why Heart Internet (UK) appears in this category
UK SMB hosting brand owned by GoDaddy.
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.
Heart Internet is a UK-based email and hosting provider serving small businesses, independent websites, and sole traders across the .co.uk domain and international TLDs.
Heart Internet's mailbox footprint is concentrated in the long tail of smaller websites rather than enterprise or major-brand domains. The frequent pairing of Heart Internet MX records with SendGrid infrastructure in audited domains suggests many Heart Internet customers use third-party mail services for outbound delivery whilst maintaining inbound mailboxes with Heart Internet. For senders and deliverability professionals, this hybrid architecture introduces authentication coordination demands: carefully aligning SPF, DKIM, and DMARC policies across both providers is essential to avoid downstream deliverability friction.
Where Heart Internet (UK) sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 1 | 0.8% |
| Top 100,000 | 7 | 5.6% |
| Top 1,000,000 | 112 | 90.3% |
| Unranked | 4 | 3.2% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 48 | 38.7% | |
| .co.uk | 42 | 33.9% | |
| .net | 7 | 5.6% | |
| .ie | 5 | 4.0% | |
| .org | 4 | 3.2% | |
| .org.uk | 3 | 2.4% | |
| .uk | 3 | 2.4% | |
| .biz | 2 | 1.6% | |
| .info | 2 | 1.6% | |
| .eu | 1 | 0.8% |
What Heart Internet (UK) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 124 domains.
| Type | Service | Domains | Share of Heart Internet (UK) users |
|---|---|---|---|
| ESP | SendGrid (Twilio) | 7 | 5.6% |
| ESP | Mandrill | 6 | 4.8% |
| ESP | Mailjet (Sinch) | 5 | 4.0% |
| ESP | Mailgun | 5 | 4.0% |
| ESP | Zendesk | 3 | 2.4% |
| ESP | Campaign Monitor | 3 | 2.4% |
| ESP | Mailchimp | 3 | 2.4% |
| ESP | Amazon SES | 3 | 2.4% |
| ESP | SparkPost | 2 | 1.6% |
| ESP | MailerSend | 1 | 0.8% |
Split mail infrastructure and authentication alignment
Heart Internet customers often delegate outbound mail delivery to commercial providers like SendGrid whilst hosting their domain's inbound mailboxes with Heart Internet. This division — where the MX record points to Heart Internet but outbound headers reference the third-party provider — requires close coordination of sender authentication standards. Without proper alignment of SPF, DKIM, and DMARC across both infrastructure points, legitimate mail can fail authentication checks and experience deliverability friction at downstream recipients.
See the full Heart Internet (UK) data page (KPI cards, trend, sample domains) →
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Frequently asked questions
What is Heart Internet's role in email infrastructure?
Heart Internet is a UK-based mailbox provider for smaller businesses and independent websites, particularly in the .co.uk domain. Its prevalence in email audits reflects its widespread use across the long tail of smaller sites, often alongside third-party services like SendGrid for outbound delivery.
How many domains use Heart Internet (UK)?
124 domains in the Tranco top-1M use Heart Internet (UK) as their mailbox provider as of September 11, 2026 (0.02% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is Heart Internet (UK) common enough to affect email deliverability testing?
Heart Internet (UK) accounts for 0.02% 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 Heart Internet (UK) most?
Heart Internet (UK)'s largest TLD is .com (38.7% of its domains); it appears across 17 TLDs in total.