According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), SenderSRV is the email service provider (ESP) for 730 domains — 0.12% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
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.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 7 | 1.0% |
| Top 100,000 | 56 | 7.7% |
| Top 1,000,000 | 524 | 71.8% |
| Unranked | 143 | 19.6% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 305 | 41.8% | |
| .lt | 40 | 5.5% | |
| .org | 32 | 4.4% | |
| .net | 32 | 4.4% | |
| .gr | 22 | 3.0% | |
| .co.uk | 16 | 2.2% | |
| .in | 13 | 1.8% | |
| .io | 13 | 1.8% | |
| .ro | 11 | 1.5% | |
| .com.br | 10 | 1.4% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 730 domains.
| Type | Service | Domains | Share of SenderSRV users |
|---|---|---|---|
| Mailbox | Google Workspace | 237 | 32.5% |
| Mailbox | Microsoft 365 | 151 | 20.7% |
| Mailbox | Self-Hosted | 144 | 19.7% |
| Mailbox | Unknown / Other | 42 | 5.8% |
| Mailbox | Cloudflare Email Routing | 13 | 1.8% |
| Mailbox | Zoho Mail | 13 | 1.8% |
| ESP | MailerSend | 65 | 8.9% |
| ESP | Amazon SES | 57 | 7.8% |
| ESP | Mailchimp | 45 | 6.2% |
| ESP | Mailgun | 43 | 5.9% |
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) →
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.
730 domains in the Tranco top-1M use SenderSRV as their email service provider (ESP) as of July 13, 2026 (0.12% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
SenderSRV accounts for 0.12% 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.
SenderSRV's largest TLD is .com (41.8% of its domains); it appears across 108 TLDs in total.