Heureka Mailing (CZ) email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 11, 2026), Heureka Mailing (CZ) is the email service provider (ESP) for 279 domains — 0.04% of 631,089 SPF-publishing domains. Its strongest TLD is .cz (63.1% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-09-11 DNS snapshot.
What Heureka Mailing (CZ) represents in this dataset
Czech price-comparison portal sending merchant notifications.
Directory category: Saas. The classification comes from include: mechanisms in the SPF record. It describes observed DNS infrastructure, not a commercial relationship and not the placement of any individual message.
What the 2026-09-11 snapshot shows about Heureka Mailing (CZ)
Across 26 distinct TLDs its top three are .cz (63.1%), .sk (18.6%), .com (2.9%) — together 84.6% of the 279 domains, which makes the footprint narrow — three TLDs cover most of it, which is typical of a regional or single-market operator. The service most often observed on the same domains is Google Workspace (Mailbox, 62 domains, 22.2% of them), followed by Microsoft 365 (19.7%). Directly comparable by the same detection rule: Amazon SES, SendGrid (Twilio), Mailgun. Ranking between them reflects what is published in DNS, not delivery quality or volume sent. All figures come from a single daily DNS snapshot (2026-09-11); a domain appears here when its published records match the include: mechanisms in the SPF record rule, which is an infrastructure fact, not a commercial relationship.
Commonly used together with Heureka Mailing (CZ)
What else the same 279 domains use — cross-tabulated from the same daily snapshot (2026-09-11).
| Type | Service | Domains | Share of Heureka Mailing (CZ) users |
|---|---|---|---|
| Mailbox | Google Workspace | 62 | 22.2% |
| Mailbox | Microsoft 365 | 55 | 19.7% |
| Mailbox | Self-Hosted | 32 | 11.5% |
| Mailbox | Unknown / Other | 27 | 9.7% |
| Mailbox | Generic / unmatched (mail.*) | 24 | 8.6% |
| Mailbox | Seznam.cz (Czech) | 19 | 6.8% |
| ESP | Amazon SES | 32 | 11.5% |
| ESP | SmartEmailing | 24 | 8.6% |
| ESP | Mandrill | 24 | 8.6% |
| ESP | SparkPost | 23 | 8.2% |
TLD distribution (top 26 of 26)
Frequently asked questions
How many domains use Heureka Mailing (CZ)?
279 domains in the Tranco top-1M use Heureka Mailing (CZ) as their email service provider (ESP) as of September 11, 2026, according to Live Direct Marketing's daily DNS scan.
What is Heureka Mailing (CZ)'s market share?
Heureka Mailing (CZ) holds 0.04% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-09-11). The number is recomputed every day.
What are the biggest alternatives to Heureka Mailing (CZ)?
The largest email service provider (ESP)s in the same category by Tranco top-1M share are: Amazon SES, SendGrid (Twilio), Mailgun, Zendesk, Mailchimp (as of 2026-09-11).
Largest email service provider (ESP)s in this category
Amazon SES (6.17%) · SendGrid (Twilio) (4.63%) · Mailgun (4.00%) · Zendesk (3.76%) · Mailchimp (3.56%) · Mandrill (3.24%) · HubSpot (3.10%) · Salesforce (2.54%) · Mailjet (Sinch) (2.12%) · Cloudflare Email Routing (1.93%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 279 domains.