Constant Contact email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 12, 2026), Constant Contact is the email service provider (ESP) for 3,585 domains — 0.57% of 629,828 SPF-publishing domains. Its share has been stable over the last 30 days. Its strongest TLD is .com (35.9% of its domains). Detection: include: mechanisms in the SPF record.
Last updated from the 2026-09-12 DNS snapshot.
What Constant Contact represents in this dataset
US small-business newsletter platform.
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 Constant Contact
Across 87 distinct TLDs its top three are .com (35.9%), .de (31.6%), .org (15.1%) — together 82.6% of the 3,585 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, 1,509 domains, 42.1% of them), followed by Google Workspace (10.9%). Its share of SPF-publishing domains has not moved measurably in 30 days. 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 Constant Contact
What else the same 3,585 domains use — cross-tabulated from the same daily snapshot (2026-09-12).
| Type | Service | Domains | Share of Constant Contact users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 1,509 | 42.1% |
| Mailbox | Google Workspace | 389 | 10.9% |
| Mailbox | Self-Hosted | 331 | 9.2% |
| Mailbox | Unknown / Other | 304 | 8.5% |
| Mailbox | Mimecast | 154 | 4.3% |
| Mailbox | Generic / unmatched (mx*.*) | 112 | 3.1% |
| ESP | Amazon SES | 355 | 9.9% |
| ESP | SendGrid (Twilio) | 346 | 9.7% |
| ESP | Salesforce | 258 | 7.2% |
| ESP | Mailchimp | 239 | 6.7% |
TLD distribution (top 30 of 87)
Frequently asked questions
How many domains use Constant Contact?
3,585 domains in the Tranco top-1M use Constant Contact as their email service provider (ESP) as of September 12, 2026, according to Live Direct Marketing's daily DNS scan.
What is Constant Contact's market share?
Constant Contact holds 0.57% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-09-12). The number is recomputed every day.
Is Constant Contact growing or declining?
Constant Contact's share has been stable over the last 30 days (±0.01 pp).
What are the biggest alternatives to Constant Contact?
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 3,585 domains.