An email service provider (ESP) allows users to send email campaigns to a list of subscribers.
Email service providers are technology companies that make it easier for people to build email lists and send emails. As email marketing has become a more popular marketing channel, more email service providers have sprung up to provide differentiated services.
At the most basic level, an ESP needs to do two things: store email addresses and send emails.
· Gmail.
· Outlook.
· Proton Mail.
· AOL.
· Zoho Mail.
· iCloud Mail.
· Yahoo! Mail.
· GMX.
· Yandex
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