Use telnet to connect to a system on which you have an SMTP email account, then send yourself an email.
Log onto the system and check that the email indeed arrived.
Consider the Simple Mail Transfer Protocol (SMTP)4.An excerpt from the RFC for this protocol provides the following sample session.
```
R: 220 USC-ISI.ARPA Simple Mail Transfer Service Ready
S: HELO LBL-UNIX.ARPA
R: 250 USC-ISI.ARPA
S: MAIL FROM:
R: 250 OK
S: RCPT TO:
R: OK
S: DATA
R: 354 Start mail input; end with
S: Blah blah blah...
S: ...etc. etc. etc.
S: .
R: 250 OK
S: QUIT
R: 221 USC-ISI.ARPA Service closing transmission channel
```
It can be done. However, please do not entertain the idea of using this technique to forge email - many mail servers will track the originating IP address of the client host and unauthorized email can be traced.
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