![]() ![]() It came out of a 1982 request from the University of Southernn California to the Internet Engineering Task Force (IETF) who are the overlords of all protocols that control movement across the internet. ![]() The first port, port 25, was implemented as the primary message transmission channel to help mitigate against attacks like man-in-the-middle. Here’s our breakdown – or “port reduction” if you will. What about the rest of the ports? How many other ports were launched over time and have they evolved? Many have, and some have even been depricated. When the SMTP protocol was first published in 1981 (the same year Lionel Richie’s Endless Love topped the charts – for perspective) it didn’t take long before the first port, port 25 was put into place to manage message traffic. Like with anything technical, where we started is not where we are now. There are many ports to choose from, but only a few that you might want to use. What different SMTP ports are there? Understanding ports 25, 465, 587 In order to determine which port is the best for you, let’s cover the most popular ports and the traffic they transmit. Everything from your message content to your authentication can impact your sender reputation and overall deliverability rate. Some ISPs may block certain ports, like port 25 to defend against spam, and default to another port, like port 587 that supports encryption.Īdding authentication protocols like SMTP AUTH can help improve your message delivery, but deliverability is a multi-ingredient pie. SMTP is the most used protocol by mail servers to communicate with one another, but that doesn't mean they're all interchangeable. SMTP ports and email deliverabilityĬhoosing the right SMTP port also helps ensure you have a strong deliverability. The port you use may be determined by the security standards of your organization, or by the sensitive contents of the messages you send. Some ports transmit encrypted messages, while other ports remain open for all types of traffic. SMTP ports and email securityĭifferent ports are associated with different security measures, so choosing the right one is key to ensure your protecting your email communications. But watch out, some ports have evolved to have a bad reputation of their own – and using these ports could keep you out of the inbox. Using the right port helps ensure delivery and supports your sener reputation. Why is it important to use the right SMTP port? ![]()
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