Ranked by the number of sites we detect running each one.
| Rank | Technology | Sites |
|---|---|---|
| 1 | SendGrid | 3.9M |
| 2 | Mailgun | 1.4M |
| 3 | Amazon SES | 1.3M |
| 4 | Postmark | 754.5K |
| 5 | MailChannels | 329.9K |
| 6 | Mailjet | 319.3K |
| 7 | Mailchimp/Mandrill | 269.1K |
| 8 | Elastic Email | 175.3K |
| 9 | SMTP2GO | 92.3K |
| 10 | SparkPost | 83.5K |
| 11 | EmailJS | 64.5K |
| 12 | Twilio | 29.1K |
| 13 | Flowmailer | 654 |
| 14 | SocketLabs | 599 |
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