An SMTP relay service acts as an intermediary between the sender and recipient's email servers, facilitating the delivery of email messages. It helps businesses ensure that their emails are sent reliably and securely, reducing the chances of them being marked as spam or blocked by recipient servers.
When an email is sent, the sender's email client or server connects to the SMTP relay service. The relay service then accepts the email, performs necessary checks, and forwards it to the recipient's server for delivery.
Source-https://smtpget.com/smtp-service-provider/
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