Port 465 was originally registered for SMTPS (SMTP over SSL). ![]() Port 587 also supports TLS, which means that you can securely submit mail. While you can use other ports for submission (more on those next), you should always start with port 587 as the default and only use a different port if circumstances dictate (like your host blocking port 587 for some reason). Port 587 is the default port for SMTP submission on the modern web. So while SMTP port 25 is great for SMTP relay, it is not a good option for SMTP submission. Remember: there’s a difference between SMTP submission and relay. Why? Because port 25 is commonly abused to send spam from compromised computers. However, if you’re setting up your WordPress site or email client with SMTP, you usually do not want to use port 25 because most residential ISPs and cloud hosting providers block port 25. Port 25 is still known as the standard SMTP port and it’s used mostly for SMTP relay. Port 25 was established all the way back in 1982, which makes it the oldest SMTP port. Instead, there are four common SMTP ports: On the modern web, there’s not a single SMTP port. While “relay” is definitely an important part of SMTP, most people don’t need to configure their own email server. If you’re setting up your email client or WordPress site, you’re mostly concerned with the “submission” part of the process. So after an email is “submitted” to the outgoing mail server, the outgoing mail server “relays” that message to the recipient’s mail server.
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