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Use Postfix with authentication and encryption
Authored by: Andrea on Mar 17, '04 06:49:42AM
I'm particular interested in this topic, and I hope you can enlight me. I've an iBook with postfix enalbled. Depending on the ISP I use some of my emails are rejected and I receive a message like this:

			The Postfix program

<fink-devel@lists.sourceforge.net>: host mail.sourceforge.net[66.35.250.206]
    said: 550-rejected because your SMTP server, 151.26.169.56, is in the DULS
    RBL. See 550 http://mail-abuse.org/referred.html for more information. (in
    reply to RCPT TO command)
Reporting-MTA: dns; ibook.homeunix.org
Arrival-Date: Sun, 29 Feb 2004 09:37:02 +0100 (CET)

Final-Recipient: rfc822; fink-devel@lists.sourceforge.net
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; host mail.sourceforge.net[66.35.250.206] said:
    550-rejected because your SMTP server, 151.26.169.56, is in the DULS RBL.
    See 550 http://mail-abuse.org/referred.html for more information. (in reply
    to RCPT TO command)
Can I solve my problem enabling SASL? Thanks, Andrea.

[ Reply to This | # ]
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".



[ Reply to This | # ]
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...



[ Reply to This | # ]
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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