I got this problem recently, and some says I have to configure the SPF and Domainkeys, But to think of it, It was working previously. So Is there guide, howto or any explanation why our Mail Relay Server (In Postfix I've done the relayhost = mail.domain.td and necessary smtp config stuff) act that way?
System Specs - Centos 5.3 - Postfix 2.3 - Bind 9.3 - openSSL 0.9
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