SMTP (Simple Mail Transfer Protocol) is a technology that sends the huge majority of emails on the internet. It's what moves the message from your email client through email servers to the recipient’s server. Port 587 is the default SMTP port for most services and should be used whenever you need a STARTTLS port.
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SMTP and SMTP ports – what are they all about?What are the standard SMTP ports?SMTP Ports – different ports for different purposesSo which one should I use?Which ports are commonly used?Wrapping upSort: