Findings / Who sends email for them← Workspace SaaS visible in DNSVendors visible per company →
08 / 10 · Who sends email for them · 1,828 YC startups
19% authorise a sending service in SPF; Amazon SES is the most common at 7.5%.
| Label | Share | Value |
|---|---|---|
 Amazon SES | 7.5% | |
 HubSpot | 3.9% | |
 SendGrid | 2.0% | |
 Resend | 1.7% | |
 Firebase Auth email | 1.4% | |
 Brevo | 1.4% | |
 Mailgun | 1.0% | |
 MailerLite | 0.7% | |
 lemlist | 0.7% | |
 Klaviyo | 0.5% |
How it was measured
From SPF includes and verification records. Services that send from a subdomain (common for Resend and Postmark) aren't visible from the apex domain.
Sample
1,828 of 1,873 listed YC startups, W24–F26. Medium confidence and up. Methodology