Mail Relay / Open Mail Replay

[informationhacker08 <informationhacker08 () gmail com>]

Suppose there is Mail server having port 25 open xyz.com
an attacker login on Mail server  through telnet and then try to send the
mail but the he can 
 only send a mail within the xyz company not outside ..so this will be
consider as Vulnerability or not

eg. telnet xyz.com 
mail from:<dddd () ddddd com>
mail rcpt :<vbn () xyz com>--->only within  the network not outside realying
the mail 

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