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  1. or download this
    [tex@smtp-client ~]$ telnet smtp-server.example.com 25
Trying xxx.xx.xxx.x...
...
250 Ok
RCPT TO: <valid-user@smtp-server.example.com>
250 Ok
  2. or download this
    [tex@smtp-client ~]$ telnet smtp-server.example.com 25
Trying xxx.xx.xxx.x...
...
250 Ok
RCPT TO: <invalid@bioinformatics.rit.edu>
450 <invalid@bioinformatics.rit.edu>: Recipient address rejected: User
+ unknown in local recipient table