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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