Constant Contact (CCSend) email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 19, 2026), Constant Contact (CCSend) is the email service provider (ESP) for 78 domains — 0.01% of 642,799 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 78 domains in the Tranco top-1M use Constant Contact (CCSend) (0.01% of SPF-publishing domains).
- Snapshot date: 2026-09-19 — recomputed every day.
- Strongest TLD: .com (69.2% of its domains).
- Most co-used service: Microsoft 365.
- Directory category: email service provider.
Why Constant Contact (CCSend) appears in this category
Constant Contact — US SMB newsletter ESP, decades-old leader.
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.
Constant Contact is an email service provider (ESP) operated by Constant Contact, Inc., enabling businesses to send and track email campaigns and transactional messages. It is authorized to send on behalf of customer domains through SPF include mechanisms, allowing organizations to delegate mail-sending authority to Constant Contact's infrastructure.
The service's global footprint is concentrated in the long tail of smaller and mid-market organizations, predominantly within .com domains, and frequently coexists with Microsoft 365 deployments. For senders and deliverability teams, this distribution pattern means Constant Contact appears regularly among smaller-brand email sources; for mail receivers and infrastructure teams, its presence in a domain's SPF record is a straightforward indication of deliberate email delegation.
Where Constant Contact (CCSend) sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 0 | 0.0% |
| Top 100,000 | 9 | 11.5% |
| Top 1,000,000 | 69 | 88.5% |
| Unranked | 0 | 0.0% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 54 | 69.2% | |
| .org | 20 | 25.6% | |
| .net | 1 | 1.3% | |
| .aero | 1 | 1.3% | |
| .us | 1 | 1.3% | |
| .in | 1 | 1.3% |
What Constant Contact (CCSend) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 78 domains.
| Type | Service | Domains | Share of Constant Contact (CCSend) users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 31 | 39.7% |
| Mailbox | Google Workspace | 21 | 26.9% |
| Mailbox | Mimecast | 4 | 5.1% |
| Mailbox | Proofpoint | 4 | 5.1% |
| Mailbox | Rackspace Email | 3 | 3.8% |
| Mailbox | Unknown / Other | 3 | 3.8% |
| ESP | Constant Contact | 35 | 44.9% |
| ESP | Mailchimp | 16 | 20.5% |
| ESP | Amazon SES | 12 | 15.4% |
| ESP | Mandrill | 11 | 14.1% |
SPF Configuration and Email Delegation
Constant Contact's role in the SPF ecosystem is as a delegated mail sender. When a domain includes Constant Contact in its SPF record, it explicitly authorizes Constant Contact's servers to send email on that domain's behalf. This configuration is particularly common among smaller and mid-market organizations that use the platform for marketing campaigns, newsletters, or transactional messages alongside their primary business email infrastructure.
See the full Constant Contact (CCSend) data page (KPI cards, trend, sample domains) →
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Frequently asked questions
What is Constant Contact, and why does it appear in SPF records?
Constant Contact is an email service provider that businesses use to send marketing campaigns and transactional messages. It appears in SPF records because customer domains explicitly authorize Constant Contact's mail servers to send email on their behalf.
How many domains use Constant Contact (CCSend)?
78 domains in the Tranco top-1M use Constant Contact (CCSend) as their email service provider (ESP) as of September 19, 2026 (0.01% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Constant Contact (CCSend) common enough to affect email deliverability testing?
Constant Contact (CCSend) accounts for 0.01% 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 Constant Contact (CCSend) most?
Constant Contact (CCSend)'s largest TLD is .com (69.2% of its domains); it appears across 6 TLDs in total.