SMTP.BZ email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 12, 2026), SMTP.BZ is the email service provider (ESP) for 756 domains — 0.12% of 629,828 SPF-publishing domains. Its strongest TLD is .ru (56.1% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-09-12 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 2026-09-12 snapshot shows about SMTP.BZ
Across 60 distinct TLDs its top three are .ru (56.1%), .com (14.7%), .net (3.8%) — together 74.6% of the 756 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, 242 domains, 32.0% of them), followed by Self-Hosted (17.5%). 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 (2026-09-12); 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 756 domains use — cross-tabulated from the same daily snapshot (2026-09-12).
| Type | Service | Domains | Share of SMTP.BZ users |
|---|---|---|---|
| Mailbox | Yandex 360 | 242 | 32.0% |
| Mailbox | Self-Hosted | 132 | 17.5% |
| Mailbox | Mail.ru for Business | 102 | 13.5% |
| Mailbox | Google Workspace | 67 | 8.9% |
| Mailbox | Unknown / Other | 20 | 2.6% |
| Mailbox | Timeweb (RU) | 18 | 2.4% |
| ESP | Unisender (RU) | 115 | 15.2% |
| ESP | SendPulse | 68 | 9.0% |
| ESP | Mindbox | 24 | 3.2% |
| ESP | Amazon SES | 23 | 3.0% |
TLD distribution (top 30 of 60)
Frequently asked questions
How many domains use SMTP.BZ?
756 domains in the Tranco top-1M use SMTP.BZ as their email service provider (ESP) as of September 12, 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 2026-09-12). 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 2026-09-12).
Largest email service provider (ESP)s in this category
Amazon SES (6.18%) · SendGrid (Twilio) (4.63%) · Mailgun (4.01%) · Zendesk (3.76%) · Mailchimp (3.57%) · Mandrill (3.25%) · HubSpot (3.11%) · Salesforce (2.55%) · Mailjet (Sinch) (2.12%) · Cloudflare Email Routing (1.94%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 756 domains.