SMTP, or Simple Mail Transfer Protocol, is a TCP/IP used to send and receive email. Most email systems use SMTP to send messages from one server to another. Messages can be retrieved using an email client using an email download protocol such as IMAP or POP3.
SMTP also delivers email from a mail client to a mail server; thus, the need to specify both an incoming and outgoing mail server when setting your email client.
SMTP uses ports 25 or 587, as some ISPs will block port 25.
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