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An SMTP relay service provider is a company or service that enables the secure and reliable transmission of email messages on behalf of their clients. They act as an intermediary between the sender and the recipient's email servers, ensuring that the emails are delivered efficiently and without being flagged as spam. These providers typically offer features such as email authentication, delivery monitoring, and spam filtering to improve deliverability rates and protect against malicious activity. By utilizing an SMTP relay service, businesses can streamline their email communication, enhance their email deliverability, and focus on their core operations without worrying about the technical aspects of email transmission.