[CentOS] setting up postfix

[Larry Martell]

On Tue, Oct 16, 2012 at 9:25 AM,  <m.roth at 5-cent.us> wrote:
> Larry Martell wrote:
>> On Tue, Oct 16, 2012 at 9:03 AM, Craig White <craig.white at ttiltd.com>
>> wrote:
>>> On Oct 16, 2012, at 7:02 AM, 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
>>>>
>>>> Here's an attempt to send mail:
> <snip>
>
>>>> But I don't receive the mail. In a file in /var/spool/postfix/defer I
>>>> see:
>>>>
>>>> <larry.martell at gmail.com>: connect to
>>>> alt2.gmail-smtp-in.l.google.com[2607:f8b0:400d:c00::1a]:25: Network is
>>>> unreachable
>>>> recipient=larry.martell at gmail.com
>>>> offset=654
>>>> dsn_orig_rcpt=rfc822;larry.martell at gmail.com
>>>> status=4.4.1
>>>> action=delayed
>>>> reason=connect to
>>>> 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?
>>>
>>> ----
>>> most home broadband providers block outbound port 25 from reaching any
>>> smtp servers other than the ones that they provide and typically require
>>> authentication in order to stop spam.
>>
>> This is not a home machine. It's my client's machine on a corporate
>> network.
>
> Have you checked with the admins who administer the corporate email and
> firewalls? They may have it blocked.

Checking with them now.