SenderSRV email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 14, 2026), SenderSRV is the email service provider (ESP) for 832 domains — 0.13% of 637,677 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 832 domains in the Tranco top-1M use SenderSRV (0.13% of SPF-publishing domains).
- Snapshot date: 2026-09-14 — recomputed every day.
- Strongest TLD: .com (42.2% of its domains).
- Most co-used service: Google Workspace.
- Directory category: email service provider.
Why SenderSRV appears in this category
Generic sender service (sendersrv.com).
We classify it as a email service provider from include: mechanisms in the SPF record matching a maintained provider rule. This is infrastructure attribution from public DNS, not evidence of a direct contract or exclusive use.
SenderSRV is an email service provider (ESP) that facilitates outbound mail delivery for websites seeking to send transactional and marketing emails. It is deployed as a shared infrastructure service accessed primarily by smaller and mid-market sites that require managed SMTP without building their own mail stack.
The service appears predominantly in the long tail of Tranco's top-1 million websites rather than among the largest brands, with international distribution across country-code and generic top-level domains and frequent pairing with Google Workspace deployments. For senders and receiving administrators, this distribution pattern signals typical smaller-site traffic and suggests SenderSRV-routed mail should be evaluated against SMB-standard deliverability and reputation factors rather than enterprise benchmarks.
Where SenderSRV sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 9 | 1.1% |
| Top 100,000 | 59 | 7.1% |
| Top 1,000,000 | 755 | 90.7% |
| Unranked | 9 | 1.1% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 351 | 42.2% | |
| .lt | 42 | 5.0% | |
| .org | 42 | 5.0% | |
| .net | 31 | 3.7% | |
| .gr | 21 | 2.5% | |
| .co.uk | 19 | 2.3% | |
| .ro | 15 | 1.8% | |
| .in | 14 | 1.7% | |
| .io | 13 | 1.6% | |
| .eu | 11 | 1.3% |
What SenderSRV users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 832 domains.
| Type | Service | Domains | Share of SenderSRV users |
|---|---|---|---|
| Mailbox | Google Workspace | 267 | 32.1% |
| Mailbox | Microsoft 365 | 165 | 19.8% |
| Mailbox | Self-Hosted | 155 | 18.6% |
| Mailbox | Unknown / Other | 43 | 5.2% |
| Mailbox | Zoho Mail | 19 | 2.3% |
| Mailbox | Cloudflare Email Routing | 16 | 1.9% |
| ESP | Amazon SES | 67 | 8.1% |
| ESP | MailerLite | 60 | 7.2% |
| ESP | Mailchimp | 47 | 5.6% |
| ESP | Mailgun | 45 | 5.4% |
SPF include delegation and reputation isolation
When a website delegates outbound mail to SenderSRV via an SPF include: mechanism, the return-path domain inherits reputation signals from SenderSRV's shared IP pool; this means that abuse or poor list-hygiene practices by other SenderSRV customers can degrade or improve your sending reputation in ways outside your direct control. Receiving systems that evaluate SenderSRV's IP ranges frequently assess sender reputation at both the SPF-include level and the individual customer return-path, so proper alignment—verifying that your domain's SPF and DMARC policy are correctly configured for SenderSRV's published ranges—is critical for deliverability.
See the full SenderSRV data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Why does SenderSRV appear in my mail server's logs?
SenderSRV appears when a website has delegated its outbound SMTP delivery to that service. Its presence reflects the practices and reputation of the customer sending to you, not an inherent property of SenderSRV itself.
How many domains use SenderSRV?
832 domains in the Tranco top-1M use SenderSRV as their email service provider (ESP) as of September 14, 2026 (0.13% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is SenderSRV common enough to affect email deliverability testing?
SenderSRV accounts for 0.13% of SPF-publishing domains 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 SenderSRV most?
SenderSRV's largest TLD is .com (42.2% of its domains); it appears across 118 TLDs in total.