Email Service Providers (ESPs)

The "shipping companies" (or "shipyards"). These are the platforms senders use to build and send their mail, like Mailchimp, SendGrid, or Constant Contact. They provide the "ships" (infrastructure) and "tools" (editors, analytics).

14 questions in this topic

What is the difference between ESP and SMTP provider? What are examples of ESPs (Mailchimp, Brevo, SendGrid, etc.)? How do ESPs connect to mailbox providers? How do ESPs manage IP pools? What’s the difference between shared and dedicated IPs? How do ESPs track deliverability performance? What are ESP postmaster relationships? How do ESPs protect their reputation? How do ESPs suspend or warn bad senders? How do ESPs integrate with validation or hygiene tools? What are ESP API rate limits? What are transactional ESPs (e.g., Postmark, SparkPost, Mailgun)? What is a hybrid ESP (marketing + transactional)? How do ESPs maintain compliance (CAN-SPAM, GDPR, etc.)?

Questions about Email Service Providers (ESPs)