[CentOS] setting up postfix

Tue Oct 16 14:58:37 UTC 2012
Joseph Spenner <joseph85750 at yahoo.com>

 >From: "m.roth at 5-cent.us" <m.roth at 5-cent.us>
>To: CentOS mailing list <centos at centos.org> 
>Sent: Tuesday, October 16, 2012 7:49 AM
>Subject: Re: [CentOS] setting up postfix
>Larry Martell wrote:
> This should be an easy one. I'm trying to get postfix going. I've
> never done this before. I followed the directions at
> http://wiki.centos.org/HowTos/postfix. I opened port 25:
> iptables -I INPUT -p tcp -m tcp --dport 25 -j ACCEPT
> But I don't receive the mail. In a file in /var/spool/postfix/defer I see:
> alt2.gmail-smtp-in.l.google.com[2607:f8b0:400d:c00::1a]:25: Network is
> unreachable
> Have I missed a step or done something wrong?

Have you tested to see if tcp/25 is really open?  From another system:

$ telnet ip.of.postfix.box 25

Do you get a sendmail/postfix message of some sort?

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