esp
According to Live Direct Marketing's daily Tranco top-1M scan (July 12, 2026), Constant Contact (CCSend) is the email service provider (ESP) for 79 domains — 0.01% of 617,244 SPF-publishing domains. Its strongest TLD is .com (68.4% of its domains). Detection: include: mechanisms in the SPF record.
What else the same 79 domains use — cross-tabulated from the same daily snapshot (2026-07-12).
| Type | Service | Domains | Share of Constant Contact (CCSend) users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 31 | 39.2% |
| Mailbox | Google Workspace | 21 | 26.6% |
| Mailbox | Mimecast | 4 | 5.1% |
| Mailbox | Proofpoint | 4 | 5.1% |
| Mailbox | Unknown / Other | 4 | 5.1% |
| Mailbox | Proofpoint Essentials | 3 | 3.8% |
| ESP | Constant Contact | 37 | 46.8% |
| ESP | Mailchimp | 13 | 16.5% |
| ESP | Amazon SES | 13 | 16.5% |
| ESP | Mandrill | 9 | 11.4% |
79 domains in the Tranco top-1M use Constant Contact (CCSend) as their email service provider (ESP) as of July 12, 2026, according to Live Direct Marketing's daily DNS scan.
Constant Contact (CCSend) holds 0.01% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-07-12). The number is recomputed every day.
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 2026-07-12).
Amazon SES (6.21%) · SendGrid (Twilio) (4.75%) · Mailgun (4.11%) · Zendesk (3.87%) · Mailchimp (3.69%) · Mandrill (3.36%) · HubSpot (3.18%) · Salesforce (2.62%) · Mailjet (Sinch) (2.13%) · Cloudflare Email Routing (1.80%)
Showing 79 of 79 domains.