Hostopia / CarrierZone mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 12, 2026), Hostopia / CarrierZone is the mailbox provider for 143 domains — 0.02% of 665,310 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 143 domains in the Tranco top-1M use Hostopia / CarrierZone (0.02% of domains with MX records).
- Snapshot date: 2026-09-12 — recomputed every day.
- Strongest TLD: .com (53.8% of its domains).
- Region skew: Global / US-skewed.
- Most co-used service: Mailgun.
- Directory category: hosting mail bundle.
Why Hostopia / CarrierZone appears in this category
Canadian wholesale hosting/mail for ISPs/telcos.
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.
Hostopia and CarrierZone provide bundled domain registration, web hosting, and email services for smaller websites globally, with concentrated presence in the .com namespace. These are not enterprise mail platforms; customers typically use them for all-in-one simplicity rather than bespoke infrastructure.
Hostopia occupies the long tail of the web—smaller brands rather than global platforms—making it a lower priority for email testing than major ISPs. However, its frequent pairing with Customer.io indicates significant volumes of transactional and marketing email flow through Hostopia's infrastructure, meaning inbox filtering and sender reputation remain relevant to delivery success even at smaller scale.
Where Hostopia / CarrierZone sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 1 | 0.7% |
| Top 100,000 | 15 | 10.5% |
| Top 1,000,000 | 126 | 88.1% |
| Unranked | 1 | 0.7% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 77 | 53.8% | |
| .net | 35 | 24.5% | |
| .com.mx | 11 | 7.7% | |
| .org | 8 | 5.6% | |
| .mx | 4 | 2.8% | |
| .ca | 2 | 1.4% | |
| .co.uk | 2 | 1.4% | |
| .dm | 1 | 0.7% | |
| .hk | 1 | 0.7% | |
| .biz | 1 | 0.7% |
What Hostopia / CarrierZone users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 143 domains.
| Type | Service | Domains | Share of Hostopia / CarrierZone users |
|---|---|---|---|
| ESP | Mailgun | 2 | 1.4% |
| ESP | Amazon SES | 2 | 1.4% |
| ESP | Customer.io | 2 | 1.4% |
| ESP | MailerLite | 1 | 0.7% |
| ESP | Constant Contact | 1 | 0.7% |
| ESP | Mandrill | 1 | 0.7% |
| ESP | Elastic Email | 1 | 0.7% |
| ESP | HubSpot | 1 | 0.7% |
| ESP | KMITD (TH) | 1 | 0.7% |
Shared IP pools and cross-customer reputation risk
Many customers on Hostopia and CarrierZone share IP addresses for outbound mail, a common architecture for shared hosting providers. This means your deliverability can be affected by other senders' reputation on the same IP; if another customer engages in poor sending practices, it may reduce your delivery rates. Monitoring your sending IP reputation externally is advisable if you rely on Hostopia for outbound mail, and requesting a dedicated IP—if available—can isolate your sender reputation.
See the full Hostopia / CarrierZone data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should I test my email against Hostopia as a priority?
Hostopia is a long-tail provider serving smaller websites, so testing against it is lower priority than major ISPs. However, if your recipient base includes small businesses or startups—especially those using transactional email platforms—include Hostopia in your test matrix.
How many domains use Hostopia / CarrierZone?
143 domains in the Tranco top-1M use Hostopia / CarrierZone as their mailbox provider as of September 12, 2026 (0.02% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is Hostopia / CarrierZone common enough to affect email deliverability testing?
Hostopia / CarrierZone 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 Hostopia / CarrierZone most?
Hostopia / CarrierZone's largest TLD is .com (53.8% of its domains); it appears across 11 TLDs in total.