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I am trying to set up a little mail server (maily for the fun and experience of it) at home (behind a NAT server, a linksys wlan access point and router...). I have dsl and a dynamic IP.
To the outside, i do not have names like server.example.com -- it always looks like example.com.
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I'm confused by this. Your dynamic IP resolves to some-funky-hostname.abbrev.isp.com. Are you saying you set up some DNS records for your domain already?
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1) How would i have to configure the MX records in order to get mail anywhere close to my mail server?
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You need to have a dynamic dns service, such as
http://www.no-ip.com/ http://www.dyndns.com http://www.zoneedit.com/
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2) What ports do i need exactly?
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Forward port 25, that's SMTP.
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3) Are there any special setting for postfix that i have to pay attention to?
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The postfix man pages and comments in the config files will take you a long way for the settings on your machine. Read those and ask more specific questions.