Question: What features might be used by (or added to) SMTP and/or a mail daemon such as sendmail to provide some resistance to email forgeries as

What features might be used by (or added to) SMTP and/or a mail daemon such as sendmail to provide some resistance to email forgeries as in the previous exercise?

Exercise 14

Most Telnet clients can be used to connect to port 25, the SMTP port, instead of to the Telnet port. Using such a tool, connect to an SMTP server and send yourself (or someone else, with permission) some forged email. Then examine the headers for evidence the message is not genuine.

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