SPF ERROR: You don't have permission to send from this domain. Your IP address is not allowed

SPF ERROR: You don't have permission to send from this domain. Your IP address is not allowed

Hello,

I can't send emails to this receip, I have this error:

xxxxxxx@telefonica.net Error, ERROR_CODE :550, ERROR_CODE :SPF ERROR: You don't have permission to send from this domain. Your IP address is not allowed

It means that telefonica.net are blocking your IP addess of your severs?

Thanks