Simple Mail Transfer Protocol, or SMTP, is the server that sends mail with email programs. When you set up an email account, you must define the SMTP address to ensure your email gets to your recipients. You need to know the exact name of this address if you are configuring or troubleshooting an email program.Which SMTP port to use?
SMTP, which is specified in RFC 5321, uses port 25 by default. It may also use port 587 and port 465. The latter, which was introduced as the port of choice for secure SMTP (a.k.a. SMTPS), is supposed to be deprecated.What is SMTP service?
SMTP is an acronym for Simple Mail Transfer Protocol. Most of Internet service providers nowadays use this protocol to send email. Email clients, also known as Mail User Agents (MUA), utilize this protocol and act as an SMTP client to distribute email messages to the recipients.