According to Live Direct Marketing's daily Tranco top-1M scan (July 12, 2026), Hoster.by (BY) is the mailbox provider for 286 domains — 0.04% of 658,108 domains with MX records. Detection method: primary MX record (lowest preference).
Hoster.by is a Belarusian mail and hosting provider serving the .by namespace and the wider CIS region. It operates as an independent mailbox infrastructure provider handling inbound mail for domain owners and small businesses, primarily within Belarus, rather than as a consumer webmail platform.
Hoster.by's footprint concentrates in the long tail of smaller and regional sites rather than global brands. Senders and receivers who work with Belarusian domains or regional CIS mail traffic encounter it regularly. Its presence in delivery audits or reputation data signals you are routing through legitimate regional infrastructure; it is neither a niche outlier nor a tier-one global player, but a standard component of the Eastern European mail ecosystem.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 0 | 0.0% |
| Top 100,000 | 12 | 4.2% |
| Top 1,000,000 | 222 | 77.6% |
| Unranked | 52 | 18.2% |
| TLD | Domains | Share | |
|---|---|---|---|
| .by | 244 | 85.3% | |
| .com | 12 | 4.2% | |
| .ru | 8 | 2.8% | |
| .net | 6 | 2.1% | |
| .xn--90ais | 4 | 1.4% | |
| .io | 2 | 0.7% | |
| .org | 2 | 0.7% | |
| .news | 1 | 0.3% | |
| .in | 1 | 0.3% | |
| .biz | 1 | 0.3% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 286 domains.
| Type | Service | Domains | Share of Hoster.by (BY) users |
|---|---|---|---|
| ESP | Unisender (RU) | 26 | 9.1% |
| ESP | SendPulse | 14 | 4.9% |
| ESP | SMTP.BZ | 3 | 1.0% |
| ESP | UniOne | 2 | 0.7% |
| ESP | Mindbox | 2 | 0.7% |
| ESP | Mailgun | 2 | 0.7% |
| ESP | DashaMail (RU) | 2 | 0.7% |
| ESP | eSputnik (UA) | 1 | 0.3% |
| ESP | MailChannels | 1 | 0.3% |
| ESP | Amazon SES | 1 | 0.3% |
Hoster.by sits alongside other CIS mail providers such as Unisender (Russia) and operates within a well-established post-Soviet mail ecosystem. When filtering systems or reputation feeds encounter Hoster.by traffic, the provider itself is legitimate and widely used for .by and regional routing, so its mere presence does not indicate spam or abuse. However, reputation data on Hoster.by may be region-specific or sparse in global databases because it operates outside the tier-one provider ecosystem. Filters and blocklists tuned to international traffic patterns may therefore have limited signal on Hoster.by's sender behaviour, making it important to test against it if your recipients skew toward Belarus or the wider CIS region.
See the full Hoster.by (BY) data page (KPI cards, trend, sample domains) →
If you send to .by domains or target Belarusian recipients, testing against Hoster.by is worthwhile; if your audience is outside the CIS region, it is unlikely to be a priority. Hoster.by is a legitimate provider and requires no special handling, but aligning your test matrix to the regions you actually serve is more efficient than testing globally.
286 domains in the Tranco top-1M use Hoster.by (BY) as their mailbox provider as of July 12, 2026 (0.04% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Hoster.by (BY) accounts for 0.04% 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.
Hoster.by (BY)'s largest TLD is .by (85.3% of its domains); it appears across 15 TLDs in total.