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SMTP is short for Simple Mail Transfer Protocol.
SMTP is a protocol for sending emails between servers. Most systems that send email over the Internet use SMTP. Emails are then retrieved with a client using either POP or IMAP.
SMTP is also generally used to send messages from a mail client (such as Outlook, Thunderbird or a mobile phone) to a mail server. This is why you need to specify both the POP or IMAP server and the SMTP server when you set up your email program. You will also need to make sure the option of SMTP authentication is enabled. For help finding this option, please check our setup guides.
A paid account is required to use SMTP.