According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), CI Solution is the SaaS sender for 97 domains — 0.02% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
CI Solution is a SaaS email sending platform that enables organisations to delegate their outbound mail infrastructure to third-party servers. Organisations typically authorise CI Solution to send email on their behalf by adding an SPF include mechanism to their domain's DNS records.
CI Solution operates primarily in the long tail of smaller websites and internationally distributed domains, with particular adoption across German-speaking regions and organisations also using Microsoft 365. For email receivers, CI Solution's presence in an SPF record indicates that mail from that domain is routed through a managed email service provider; reputation issues affecting CI Solution's infrastructure can thus propagate to any domain that delegates to it.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 1 | 1.0% |
| Top 100,000 | 3 | 3.1% |
| Top 1,000,000 | 78 | 80.4% |
| Unranked | 15 | 15.5% |
| TLD | Domains | Share | |
|---|---|---|---|
| .de | 44 | 45.4% | |
| .com | 36 | 37.1% | |
| .ch | 4 | 4.1% | |
| .at | 3 | 3.1% | |
| .eu | 3 | 3.1% | |
| .cc | 1 | 1.0% | |
| .net | 1 | 1.0% | |
| .us | 1 | 1.0% | |
| .fitness | 1 | 1.0% | |
| .ruhr | 1 | 1.0% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 97 domains.
| Type | Service | Domains | Share of CI Solution users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 58 | 59.8% |
| Mailbox | Unknown / Other | 13 | 13.4% |
| Mailbox | Self-Hosted | 7 | 7.2% |
| Mailbox | Hornetsecurity | 6 | 6.2% |
| Mailbox | Barracuda | 3 | 3.1% |
| Mailbox | Sophos Email | 2 | 2.1% |
When CI Solution appears in a domain's SPF record, that domain has outsourced email sending to a shared infrastructure provider. This means many organisations send mail through CI Solution's servers simultaneously. A reputation incident—sudden spike in complaints, spam reports, or delivery failures—can affect all downstream domains, not just the one originally responsible. Email receivers often rate-limit or scrutinise traffic from high-volume shared senders more heavily than dedicated infrastructure; a domain using CI Solution may encounter deliverability friction if CI Solution's IP reputation declines, regardless of the individual domain's sending practices.
See the full CI Solution data page (KPI cards, trend, sample domains) →
CI Solution's presence in your SPF record indicates your domain is outsourcing email sending to their servers. Your domain's deliverability will be affected both by your own sending reputation and by CI Solution's reputation; if their infrastructure encounters delivery problems, your mail may be affected even if your domain's history is clean.
97 domains in the Tranco top-1M use CI Solution as their SaaS sender as of July 13, 2026 (0.02% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
CI Solution accounts for 0.02% 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.
CI Solution's largest TLD is .de (45.4% of its domains); it appears across 12 TLDs in total.