While both protocols create a private channel between the sending and receiving computer to secure transmissions, TLS offers more alerts than its ancestor and can execute more hash functions to enhance encrypted communication. With the adoption of its new-and-improved descendent, Transport Layer Security (TLS), electronic communications became even more secure. SSL was the go-to standard security protocol for common email ports in the not-too-distant past. While SMTP could be the muscle and bones of the process, Secure Sockets Layer (SSL) forms the skin to keep your email secure. For email and SMTP, that port number is… well, it depends.īoth technologies facilitate email sending. But not as many of us know that these network addresses also include specific “port numbers.” An “SMTP port” refers to the specific part of the Internet address that’s used to transfer email. All of us today are familiar with the textual version of these addresses, like Most of us know that the text address stands in for a numeric IP address like 107.21.246.67. Like other Internet services such as web sites, SMTP email relies on domain names and Internet addresses to know where to send messages. (On the other hand, mail apps typically rely on other standards such as IMAP or POP3 to retrieve emails from servers.)

SMTP is also used by applications such as Apple Mail or Outlook to upload emails to mail servers that then relay them to other mail servers. SMTP (Simple Mail Transfer Protocol) is the basic standard that mail servers use to send email to one another across the internet. So, which of these should be your standard SMTP port? Here’s what you need to know, and why.

People configuring an app or mail system to send (or relay) email often have a common question: “What SMTP port should I use?” You might see information that tells you to use ports 25, 465, 587, or 2525 for SMTP relay.

Which SMTP Port Should I Use: Port 25, 465, 587 or 2525?

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