See which email platforms your business is using

Zendesk
Klayvio
Mailchimp
Mailgun
Sendgrid
Salesforce
Marketo
AWS SES
Intercom
Hubspot
Constant Contact
Autopilot
Sendinblue
Sparkpost
ActiveCampaign
Campaign Monitor
AWeber
Mailjet

This might not be completely accurate! Contact us to request more platforms.