On Tue, Oct 16, 2012 at 8:58 AM, Joseph Spenner <joseph85750@xxxxxxxxx> wrote:
>
>
>
> ________________________________
> >From: "m.roth@xxxxxxxxx" <m.roth@xxxxxxxxx>
>>To: CentOS mailing list <centos@xxxxxxxxxx>
>>Sent: Tuesday, October 16, 2012 7:49 AM
>>Subject: Re: 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?
No, I can't connect:
# telnet 10.188.36.207 25
Connecting To 10.188.36.207...Could not open connection to the host, on port 25:
Connect failed
iptables shows that port open:
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere tcp dpt:smtp
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere tcp dpt:smtp
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