SMTP server

A Simple Mail Transfer Protocol (SMTP) server is an outgoing mail server that relays email messages brands send using the SMTP protocol. Typically, brands use two ways to send emails: SMTP or email Application Programming Interface (API). When emails are sent via SMTP, the email client relays the email via an SMTP port to an SMTP server, which authenticates the message before sending it to a receiving mail server. Lastly, the recipient’s email client retrieves the message using the Internet Message Access Protocol (IMAP).