According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), CodeTwo Email Signatures 365 is the SaaS sender for 4,373 domains — 0.71% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
CodeTwo Email Signatures 365 is a SaaS platform that operates as an authorised mail relay for organisations using Microsoft 365, handling the generation and delivery of email signatures on behalf of customer domains. It appears in email infrastructure through SPF authorisation records, where domain owners must explicitly list CodeTwo's sending servers as legitimate sources of outbound mail.
CodeTwo's deployment footprint is concentrated among smaller and mid-market organisations rather than the largest global enterprises, spread internationally across numerous TLDs with a notable presence at the .com level. Its frequent co-occurrence with Microsoft 365 infrastructure in SPF records reflects its positioning as a specialised service within Microsoft-centric corporate email deployments.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 18 | 0.4% |
| Top 100,000 | 379 | 8.7% |
| Top 1,000,000 | 3,571 | 81.7% |
| Unranked | 405 | 9.3% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 1,966 | 45.0% | |
| .de | 535 | 12.2% | |
| .org | 264 | 6.0% | |
| .com.au | 130 | 3.0% | |
| .co.uk | 115 | 2.6% | |
| .pl | 97 | 2.2% | |
| .nl | 93 | 2.1% | |
| .it | 89 | 2.0% | |
| .ch | 69 | 1.6% | |
| .at | 67 | 1.5% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 4,373 domains.
| Type | Service | Domains | Share of CodeTwo Email Signatures 365 users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 2,999 | 68.6% |
| Mailbox | Mimecast | 267 | 6.1% |
| Mailbox | Unknown / Other | 240 | 5.5% |
| Mailbox | Proofpoint | 152 | 3.5% |
| Mailbox | Self-Hosted | 138 | 3.2% |
| Mailbox | Barracuda | 123 | 2.8% |
When CodeTwo relays or processes outbound mail on a domain's behalf, the domain owner must authorise CodeTwo's infrastructure via SPF records, typically using an include mechanism to reference CodeTwo's sending servers. Without this authorisation, recipient mailboxes may reject or flag CodeTwo-handled messages for failing authentication checks. Organisations using CodeTwo must keep their SPF, DKIM, and DMARC records synchronised with CodeTwo's published sender IP ranges and certificate details to maintain deliverability and prevent mail loss.
See the full CodeTwo Email Signatures 365 data page (KPI cards, trend, sample domains) →
CodeTwo Email Signatures 365 appears in your SPF records because your organisation has authorised the service to send mail on your domain's behalf. The SPF entry tells receiving mail servers that CodeTwo is a legitimate sender for your domain, typically because you use CodeTwo to handle email signature insertion and relay.
4,373 domains in the Tranco top-1M use CodeTwo Email Signatures 365 as their SaaS sender as of July 13, 2026 (0.71% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
CodeTwo Email Signatures 365 accounts for 0.71% 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.
CodeTwo Email Signatures 365 has been stable — its share moved +0.01 pp over the last 30 days (as of July 13, 2026).
CodeTwo Email Signatures 365's largest TLD is .com (45.0% of its domains); it appears across 168 TLDs in total.