According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Amazon WorkMail is the mailbox provider for 4,665 domains — 0.71% of 658,711 domains with MX records. Detection method: primary MX record (lowest preference).
Amazon WorkMail is Amazon's enterprise email service, enabling organisations to host business email on AWS infrastructure under their own domain. Operated as part of AWS, it provides SMTP, IMAP, and Outlook/mobile connectivity without dependence on third-party email hosts.
WorkMail's footprint concentrates in the .com domain space among smaller sites rather than the largest brands, and pairs frequently with Amazon SES, reflecting adoption chiefly among small businesses and AWS-native organisations in US and global markets. For senders, this means encountering WorkMail recipients primarily in the SMB and startup segments; for recipients using WorkMail, their inboxes benefit from AWS-native sender reputation systems, with feedback loops between SES and WorkMail tightly integrated within the same infrastructure.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 10 | 0.2% |
| Top 10,000 | 92 | 2.0% |
| Top 100,000 | 755 | 16.2% |
| Top 1,000,000 | 3,325 | 71.3% |
| Unranked | 483 | 10.4% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 2,158 | 46.3% | |
| .net | 320 | 6.9% | |
| .jp | 264 | 5.7% | |
| .io | 259 | 5.6% | |
| .org | 136 | 2.9% | |
| .com.br | 114 | 2.4% | |
| .cloud | 100 | 2.1% | |
| .de | 67 | 1.4% | |
| .app | 58 | 1.2% | |
| .co.uk | 51 | 1.1% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 4,665 domains.
| Type | Service | Domains | Share of Amazon WorkMail users |
|---|---|---|---|
| ESP | Amazon SES | 2,193 | 47.0% |
| ESP | Zendesk | 141 | 3.0% |
| ESP | SendGrid (Twilio) | 138 | 3.0% |
| ESP | Mailgun | 88 | 1.9% |
| ESP | Mailchimp | 67 | 1.4% |
| ESP | Mandrill | 66 | 1.4% |
| ESP | Salesforce | 54 | 1.2% |
| ESP | HubSpot | 44 | 0.9% |
| ESP | Mailjet (Sinch) | 41 | 0.9% |
| ESP | Brevo (ex-Sendinblue) | 33 | 0.7% |
Organisations using both WorkMail and Amazon SES operate within a closed feedback loop: bounce and complaint signals from WorkMail mailboxes directly shape SES sender reputation, without intermediary ISP latency. For senders using SES, this integration means that delivery problems and reputation recovery when mailing to WorkMail recipients remain native to your AWS account, rather than opaque to an external provider. This efficiency appeals to companies consolidating their email stack within AWS.
See the full Amazon WorkMail data page (KPI cards, trend, sample domains) →
Testing against WorkMail is valuable if small businesses or AWS-native startups form a material part of your recipient base, but less critical than testing major consumer ISPs for bulk senders. Prioritise WorkMail testing if SMB penetration matters to your sending strategy.
4,665 domains in the Tranco top-1M use Amazon WorkMail as their mailbox provider as of July 13, 2026 (0.71% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Amazon WorkMail accounts for 0.71% of domains with MX records 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.
Amazon WorkMail is declining — its share moved -0.01 pp over the last 30 days (as of July 13, 2026).
Amazon WorkMail's largest TLD is .com (46.3% of its domains); it appears across 282 TLDs in total.