An SMTP relay service allows businesses to send bulk emails seamlessly while protecting their sender reputation and avoiding being blocklisted. It acts as a middleman, transmitting email messages from one server to another, much like an Olympic relay race. This service provides several benefits, including becoming the business's sending infrastructure, allowing large volumes of emails to be sent, expert technical support, clear deliverability issues and data insights, and time-saving, user-friendly interfaces. When choosing an SMTP relay service, it's essential to look for a company with a great reputation, reliable infrastructure, and established track record, as well as easy documentation, excellent support availability, and positive public reviews. By using an SMTP relay service, businesses can overcome challenges in email deliverability without worrying about technical elements or jeopardizing their ability to send emails.