Email error please help

Hi

someone can explane me why i get this error

2005-04-26 08:12:15 1DQJI2-0003p1-8Q == macchini@domain1.com R=lookuphost T=remote_smtp defer (0): SMTP error from remote mailer after MAIL FROM:<a@domain2.com> SIZE=2756: host mx1.domain1.com [193.70.192.90]: 451 <a@domain2.com> unable to verify address

i have this problem only for the emai that are send from domain1.com MX

thank u

 

 

 

 

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