Exim error Administrative prohibition

all the email i'm trying to send/recieve they all went into the message queue and when it ry to manually deliver i get this error

SMTP<< 550 Administrative prohibition
SMTP>> QUIT
LOG: MAIN
** xx@xx.net <root@x.com> R=lookuphost T=remote_smtp: SMTP error from remote mailer after end of data: host kinkybullet.net [x.x.x.x]: 550 Administrative prohibition
LOG: MAIN
Frozen (delivery error message)

does any1 know what the problem is?

thanks in advance

 

 

 

 

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