Email service providers, indexed.

Twilio SendGrid — large-scale transactional and marketing ESP.

include:sendgrid.net

Developer-first transactional ESP with strong API and EU region.

include:mailgun.org

Low-cost AWS-native transactional sending with per-region endpoints.

include:amazonses.com

Transactional-only ESP with very strict abuse policies and high inboxing.

include:spf.mtasv.net

Developer-focused transactional ESP with React Email integration.

include:amazonses.com

Established marketing platform with templated campaigns and automation.

include:servers.mcsv.net

E-commerce-focused marketing automation with Shopify-grade segmentation.

include:_spf.klaviyomail.com

CRM-integrated marketing automation with form, email, and workflow tools.

include:_spf.hubspot.com

European marketing + transactional ESP with a competitive free tier.

include:spf.brevo.com

Behavioural messaging platform for SaaS lifecycle and onboarding flows.

include:mail.customeriomail.com

Affordable marketing ESP popular with creators and small brands.

include:_spf.mlsend.com

Creator-focused newsletter platform with strong automation primitives.

include:_spf.convertkit-mail.com

Hosted newsletter platform for paid and free subscribers.

Modern newsletter platform with monetisation features and a custom-domain option.

include:_spf.beehiiv.com

High-volume transactional ESP, formerly Message Systems Momentum.

include:sparkpostmail.com