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$ echo "Hello" | mail claudius
by claudius 12y ago
$ echo "Hello" | mail claudius
- astrodust 12y agoThat's local mail, not internet mail. Technically you're talking about a local mailbox, not an email address.
- mcv 12y agoLocal email addresses are of course easier to identify. You can just check if the user exists on the server. But that's not much use to websites and other online services.
- thwarted 12y agoNot necessarily, "checking if the user exists on the server" is ambiguous. You could check /etc/passwd, but the mail system may use virtual users for "local" delivery, where "local" is defined in this case as not requiring a domain portion. The only way to even check if a user exists even locally is to try to send it mail.