Emsd1 (transactional) email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 12, 2026), Emsd1 (transactional) is the email service provider (ESP) for 2,884 domains — 0.46% of 629,828 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 2,884 domains in the Tranco top-1M use Emsd1 (transactional) (0.46% of SPF-publishing domains).
- Snapshot date: 2026-09-12 — recomputed every day.
- 30-day share change: -0.01 pp.
- Strongest TLD: .com (56.9% of its domains).
- Most co-used service: Google Workspace.
- Directory category: email service provider.
Why Emsd1 (transactional) appears in this category
Generic transactional/marketing infra (emsd1.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.
Emsd1 (transactional) is an email service provider specialising in transactional messages — such as password resets, account confirmations, and operational notifications. It operates as a backend mail relay and is identified in email authentication records through its SPF include mechanism.
Emsd1's adoption is concentrated among smaller and mid-market .com websites and frequently appears alongside Google Workspace, reflecting a common pattern where transactional mail is routed through a dedicated provider separate from general business email. This separation affects both senders, who must properly configure Emsd1 in their SPF records, and receivers, who recognise this configuration as a deliberate architecture choice.
Where Emsd1 (transactional) sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 19 | 0.7% |
| Top 100,000 | 352 | 12.2% |
| Top 1,000,000 | 2,497 | 86.6% |
| Unranked | 16 | 0.6% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 1,642 | 56.9% | |
| .org | 193 | 6.7% | |
| .nl | 158 | 5.5% | |
| .com.br | 146 | 5.1% | |
| .de | 59 | 2.0% | |
| .com.au | 54 | 1.9% | |
| .io | 52 | 1.8% | |
| .net | 46 | 1.6% | |
| .dk | 44 | 1.5% | |
| .co.uk | 34 | 1.2% |
What Emsd1 (transactional) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 2,884 domains.
| Type | Service | Domains | Share of Emsd1 (transactional) users |
|---|---|---|---|
| Mailbox | Google Workspace | 1,363 | 47.3% |
| Mailbox | Microsoft 365 | 904 | 31.3% |
| Mailbox | Self-Hosted | 146 | 5.1% |
| Mailbox | Unknown / Other | 98 | 3.4% |
| Mailbox | Mimecast | 62 | 2.1% |
| Mailbox | Barracuda | 34 | 1.2% |
| ESP | Amazon SES | 480 | 16.6% |
| ESP | SendGrid (Twilio) | 435 | 15.1% |
| ESP | Zendesk | 368 | 12.8% |
| ESP | Mailchimp | 335 | 11.6% |
SPF authentication and transactional mail routing
When organisations route transactional mail through Emsd1, they must include Emsd1's SPF mechanism in their authorised sender policy, enabling receiving servers to verify message legitimacy. This separation of transactional routing from general domain mail is a deliverability best practice, isolating the reputation and bounce handling of account-related messages from marketing communications.
See the full Emsd1 (transactional) data page (KPI cards, trend, sample domains) →
Run a free inbox-placement test across Gmail, Outlook, Yahoo and more — see exactly where your mail lands and why.
Frequently asked questions
What is Emsd1 and why does it appear in email authentication records?
Emsd1 is a transactional email provider that handles account-related messages like password resets and confirmations. It appears in SPF records because organisations must explicitly authorise Emsd1's servers as legitimate senders in their domain's authentication policies.
How many domains use Emsd1 (transactional)?
2,884 domains in the Tranco top-1M use Emsd1 (transactional) as their email service provider (ESP) as of September 12, 2026 (0.46% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Emsd1 (transactional) common enough to affect email deliverability testing?
Emsd1 (transactional) accounts for 0.46% 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.
Is Emsd1 (transactional) growing or declining?
Emsd1 (transactional) is declining — its share moved -0.01 pp over the last 30 days (as of September 12, 2026).
Which countries or TLDs use Emsd1 (transactional) most?
Emsd1 (transactional)'s largest TLD is .com (56.9% of its domains); it appears across 115 TLDs in total.