How to Set Up a Smarthost SMTP Relay with cPanel
https://www.cpanel.net/blog/tips-and-tricks/how-to-set-up-a-smarthost-smtp-relay-with-cpanel/
WebAug 7, 2020 · What is a Smarthost? A Smarthost is an email relay operated by a third party, which might be an ISP, a hosting provider, or a company that specializes in improving delivery rates. Hosts send messages to the relay, which sends them back out onto the internet. How does that help you to deliver emails?
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