postfix error

Hi i'm trying to send email to a postix server but a strange error appears:

This is the Postfix program at host smtp-01.servidoresdns.net.

I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the message returned below.

The Postfix program

<sbj4701@lmtp.main.xxx>: host llca569-a.sxxxns.net[xx6.1x8.1x]
said: 554 5.6.0 Message contains NUL characters (in reply to end of DATA
command)

Anyone knows how can i fix this? Thanks a lot.

 

 

 

 

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