Email service providers

The platform each brand actually sends with, detected from the email headers, and real campaigns sent from each.

Klaviyo

2,848 campaigns from 117 brands

Salesforce Marketing Cloud

1,352 campaigns from 27 brands

SendGrid

427 campaigns from 17 brands

Braze

450 campaigns from 15 brands

Iterable

284 campaigns from 11 brands

Attentive

82 campaigns from 7 brands

Cordial

433 campaigns from 5 brands

Bloomreach

94 campaigns from 5 brands

SparkPost

186 campaigns from 4 brands

Beehiiv

47 campaigns from 3 brands

Sailthru

42 campaigns from 3 brands

Oracle Responsys

37 campaigns from 3 brands

Also seen, with fewer than 3 brands or 20 campaigns so far: Emarsys (2 brands), HubSpot (2 brands), Mailchimp (2 brands), Amazon SES (2 brands), Customer.io (2 brands), Mailgun (2 brands), Brevo (2 brands), Intercom (1 brand), Substack (1 brand).