Here is my situation:                                                           
I am using postfix MTA.                                                         
I have free email account with gmail.com and yahoo.com.au (and others)          
                                                                                
Until now I was using using my ISP smtp server as relayhost.                    
Everything was fine till few days ago my ISP refuse to relay mail that          
I send as u...@yahoo.com.au or u...@gmail.com. It only now relay                
emails that use email address my ISP provided to me.  I do not want to          
use this email because in no time spamers will get it and flood my              
primary mailbox.                                                                
                                                                                
I could try to let postfix send emails directly without relayhost but           
I suspect that dynamic IP I will be assigned when I dial-up to                  
internet will be blacklisted already and many smtp servers will refuse          
to accept email this way.                                                       
                                                                                
Therefore I am wondering if there is possible to setup postfix                  
in such a way that it relay emails that are FROM u...@gmail.com                 
to smtp.gmail.com and emails that are FROM u...@yahoo.com.au                    
to smtp.mail.yahoo.com etc...?                                                  
       
                                                                                
I was reading postfix docs and closest what I found is transport                
table. But it will not do what I want since it choose relay host based          
on destination address. I need it to chose relay host based on the              
originating address (From: header).                                             
                                                                                
If postfix can not do this maybe some other MTA can?                            
                                                                                
Martin



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