Sending E-Mail
In this section, we show you a practical example of socket programming: a program that sends e-mail to a remote site.
To send e-mail, you make a socket connection to port 25, the SMTP port. SMTP is the Simple Mail Transport Protocol that describes the format for e-mail messages. You can connect to any server that runs an SMTP service. On UNIX machines, that service is typically implemented by the sendmail daemon. However, the server must be willing to accept your request. It used to be that sendmail servers were routinely willing to route e-mail from anyone, but in these days of spam floods, most servers now have built-in checks and accept requests only from users, domains, or IP address ranges that they trust.
Once you are connected ...
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