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. Companies like Constant Contact (founded 1995), Mailchimp (2001), SendGrid, and Cakemail pioneered this category. 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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