ESPs or Email Service Providers are businesses that provide a service for businesses to send marketing campaigns. The providers can have many features to help businesses manage their mailing lists, design the emails, improve deliverability, and send out the emails smoothly. ESPs make it easy for companies to run their marketing campaigns in order to nurture leads, increase sale and build a great relationship with the customers. There are many different service providers available and not all of them offer the same features. Since email marketing fits all kinds of businesses, ESPs are used by both big and small businesses. Email Service Providers are an important part of any business’s marketing strategy.