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Use Postfix with authentication and encryption
Authored by: elemental on Mar 17, '04 09:57:48AM

The problem you are experiencing is that many ISPs deny mail sent directly from dynamic IP address space (dialups, many DSL ranges, most cable modems). This is called "direct-to-mx" mailing and it's commonly done by spammers to get around their ISP's outgoing mail restrictions. It also blocks mail from home users' Windows machines with spam-relay proxies installed (eg, Sobig, etc).

The solution is to smarthost your mail through your ISP's SMTP server. I don't know how to do it in Postfix, but look for "smarthost" or something along the lines of "forward outgoing mail to this server for delivery".



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Use Postfix with authentication and encryption
Authored by: aamann on Mar 17, '04 01:02:54PM

"Postfix Enabler" has a text field in the setup pane allowing you to enter a smart host - works for me sending mail to any address I want...



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Postfix and Smarthost
Authored by: jablko on Apr 29, '04 10:02:39PM

Yeah ... I must use a smarthost to send to some domains. I use "relayhost = domain.name" or "relayhost = [host.name]" in "/etc/postfix/main.cf"... See "http://www.postfix.org/postconf.5.html#relayhost"



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