The Simple Mail Transfer Protocol (SMTP) is an
Internet standard outlined by Internet Engineering Task Force (IETF)
that can be used for sending email messages. Recently, all internet
providers use this protocol for sending email.
If you use SMTP,
there should be a client sending the messages and the server receiving them.
Your email program utilizes this protocol and acts as an SMTP client to
distribute email messages to recipients. In most cases, you can configure
and use any email client the same way you do with your regular email clients
like Microsoft Outlook, for instance. You can specify the SMTP server that
your Internet provider gave you. When the SMTP Client sends email messages, it
connects to the SMTP server you have specified, and communicates with it using
the SMTP protocol.