can not send e-mails to hotmail

hi all,
a few months ago we have started a new dedicated box on layeredtech,and set it up like we did all our other boxes,including the reverse dns etc. but no client on a domain on that server can send e-mails to hotmail. we get a reply like :

retry time not reached for any host after a long failure period

this only happens when we send mails to hotmail. has anyone had a problem like that? if yes,could you solve it? how?

please let me know if you need any other info.

thanks for reading.

TLM

 

 

 

 

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