SMTP.com 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.com is the email service provider (ESP) for 1,527 domains — 0.24% of 629,828 SPF-publishing domains. Its strongest TLD is .com (60.8% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-09-12 DNS snapshot.
What SMTP.com represents in this dataset
Long-running US SMTP relay service for marketers.
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.com
Across 110 distinct TLDs its top three are .com (60.8%), .org (7.5%), .co.uk (4.4%) — together 72.7% of the 1,527 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 Microsoft 365 (Mailbox, 453 domains, 29.7% of them), followed by Google Workspace (29.3%). 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.com
What else the same 1,527 domains use — cross-tabulated from the same daily snapshot (2026-09-12).
| Type | Service | Domains | Share of SMTP.com users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 453 | 29.7% |
| Mailbox | Google Workspace | 448 | 29.3% |
| Mailbox | Self-Hosted | 135 | 8.8% |
| Mailbox | Mimecast | 76 | 5.0% |
| Mailbox | Unknown / Other | 59 | 3.9% |
| Mailbox | Proofpoint | 33 | 2.2% |
| ESP | Amazon SES | 189 | 12.4% |
| ESP | Zendesk | 154 | 10.1% |
| ESP | SendGrid (Twilio) | 146 | 9.6% |
| ESP | Mailgun | 108 | 7.1% |
TLD distribution (top 30 of 110)
Frequently asked questions
How many domains use SMTP.com?
1,527 domains in the Tranco top-1M use SMTP.com as their email service provider (ESP) as of September 12, 2026, according to Live Direct Marketing's daily DNS scan.
What is SMTP.com's market share?
SMTP.com holds 0.24% 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.com?
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 1,527 domains.