>A networking instructor on campus generously showed his students how to
>send mail from spoofed addresses from within our system.
Did he explain the whole telnet to port 25 procedure along with the
commands to send, or did he just say "Enter the address you want to spoof
in your E-mail client?"
For those that don't know, an E-mail address is just whatever the sender
says it is, exactly the same as the return address on an envelope. If you
tell your mail client that you are "[EMAIL PROTECTED]", well, it's not
going to know any differently.
Of course, someone sending E-mail using a forged return address won't be
able to receive responses, to its usefulness is fairly limited. As far as
I know, the only way to prevent this in IMail is to use an anti-relay
setting that will allow spammers to do the same thing (use YOUR domain as a
return address, and then they will be able to send mail).
-Scott
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