Mail sending failures when destination has multiple MX servers

[Rafael Azevedo]

Hi Guys, 



I noticed lots of errors like this on my log files: 

Client host rejected: Please try primary mx first (in reply to RCPT TO 
command)) 

So I checked the domain and it has multiple mx servers, with different priority 
each one. 

Then I ask: why is postfix using secondary mx server unstead of trying sending 
to primary first? Is there anyway to force this out? 

Thanks in advance. 
-- Rafael