GMX mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 18, 2026), GMX is the mailbox provider for 11 domains — 0.00% of 675,783 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 11 domains in the Tranco top-1M use GMX (0.00% of domains with MX records).
- Snapshot date: 2026-09-18 — recomputed every day.
- Strongest TLD: .de (18.2% of its domains).
- Region skew: Germany.
- Directory category: mailbox provider.
Why GMX appears in this category
United Internet consumer brand, popular in Germany/Austria.
We classify it as a mailbox provider 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.
GMX is a mailbox provider and email infrastructure service with significant operational presence in European markets, particularly Germany. It hosts email for numerous organisations across the Tranco top-1 million list of high-traffic domains, serving a global audience with regional concentration in German-speaking regions.
GMX's footprint among well-known and enterprise-grade organisations means senders and recipients working with GMX-hosted email need to understand its infrastructure and filtering policies. For senders, reliable delivery to GMX depends on adhering to email authentication standards and maintaining sender reputation; for recipients, GMX's infrastructure influences their inbound filtering thresholds.
Where GMX sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 1 | 9.1% |
| Top 100,000 | 7 | 63.6% |
| Top 1,000,000 | 3 | 27.3% |
| Unranked | 0 | 0.0% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .de | 2 | 18.2% | |
| .com | 2 | 18.2% | |
| .net | 1 | 9.1% | |
| .at | 1 | 9.1% | |
| .ch | 1 | 9.1% | |
| .co.uk | 1 | 9.1% | |
| .es | 1 | 9.1% | |
| .fr | 1 | 9.1% | |
| .us | 1 | 9.1% |
Authentication standards and sender filtering
GMX's prevalence among high-traffic and established organisations reflects the maturity of senders using its infrastructure. Email authentication (SPF, DKIM, DMARC) is industry standard across large mailbox providers and directly influences filtering decisions; senders targeting GMX-hosted domains should ensure their authentication records are properly configured and their sending infrastructure maintains a credible reputation.
See the full GMX data page (KPI cards, trend, sample domains) →
Run a free inbox-placement test across Gmail, Outlook, Yahoo and more — see exactly where your mail lands and why.
Frequently asked questions
Does GMX filtering matter for my email programme?
GMX hosts mail for high-traffic and enterprise organisations with concentration in German-speaking markets. If your recipient list includes .de domains, organisations in European markets, or domains among the top-1 million websites, GMX inbox placement directly impacts your deliverability success.
How many domains use GMX?
11 domains in the Tranco top-1M use GMX as their mailbox provider as of September 18, 2026 (0.00% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is GMX common enough to affect email deliverability testing?
GMX accounts for 0.00% 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 GMX most?
GMX's largest TLD is .de (18.2% of its domains); it appears across 9 TLDs in total.