What is an ESP?
An Email Service Provider handles large scale sending, templating, segmentation, and analytics for businesses. It manages SMTP delivery, infrastructure, authentication, and compliance. Pioneers like Constant Contact (founded 1995) and Mailchimp (2001) defined the category. Today the market includes SendGrid, Smaily, Cakemail, and hundreds more. It is the fully equipped fleet ready to send thousands of messages across many harbors with precision and reliability. The real value an ESP provides is deliverability, including automated FBL handling, bounce processing, IP warmup, and analytics that keep the fleet sailing smoothly.
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