SMTP.BZ email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 24, 2026), SMTP.BZ is the email service provider (ESP) for 795 domains — 0.12% of 637,420 SPF-publishing domains. Its strongest TLD is .ru (55.1% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-09-24 DNS snapshot.
What SMTP.BZ represents in this dataset
Low-cost transactional SMTP relay.
Directory category: Esp. 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 2026-09-24 snapshot shows about SMTP.BZ
Across 64 distinct TLDs its top three are .ru (55.1%), .com (14.7%), .net (4.0%) — together 73.8% of the 795 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 Yandex 360 (Mailbox, 250 domains, 31.4% of them), followed by Self-Hosted (18.0%). 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 (2026-09-24); 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 SMTP.BZ
What else the same 795 domains use — cross-tabulated from the same daily snapshot (2026-09-24).
| Type | Service | Domains | Share of SMTP.BZ users |
|---|---|---|---|
| Mailbox | Yandex 360 | 250 | 31.4% |
| Mailbox | Self-Hosted | 143 | 18.0% |
| Mailbox | Mail.ru for Business | 109 | 13.7% |
| Mailbox | Google Workspace | 69 | 8.7% |
| Mailbox | Unknown / Other | 22 | 2.8% |
| Mailbox | Cloudflare Email Routing | 19 | 2.4% |
| ESP | Unisender (RU) | 119 | 15.0% |
| ESP | SendPulse | 73 | 9.2% |
| ESP | Mindbox | 25 | 3.1% |
| ESP | Amazon SES | 23 | 2.9% |
TLD distribution (top 30 of 64)
Frequently asked questions
How many domains use SMTP.BZ?
795 domains in the Tranco top-1M use SMTP.BZ as their email service provider (ESP) as of September 24, 2026, according to Live Direct Marketing's daily DNS scan.
What is SMTP.BZ's market share?
SMTP.BZ holds 0.12% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-09-24). The number is recomputed every day.
What are the biggest alternatives to SMTP.BZ?
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 2026-09-24).
Largest email service provider (ESP)s in this category
Amazon SES (6.23%) · SendGrid (Twilio) (4.68%) · Mailgun (4.01%) · Zendesk (3.77%) · Mailchimp (3.61%) · Mandrill (3.26%) · HubSpot (3.18%) · Salesforce (2.57%) · Mailjet (Sinch) (2.14%) · Cloudflare Email Routing (1.96%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 795 domains.