[CentOS] setting up postfix

Larry Martell larry.martell at gmail.com
Tue Oct 16 11:15:16 EDT 2012


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:
>>
>> [motor at localhost motor]# mail -v larry.martell at gmail.com
>> Subject: test
>> test
>> .
>> EOT
>> larry.martell at gmail.com... Connecting to [127.0.0.1] via relay...
>> 220 localhost.localdomain ESMTP Postfix
>>>>> EHLO localhost.localdomain
>> 250-localhost.localdomain
>> 250-PIPELINING
>> 250-SIZE 10240000
>> 250-VRFY
>> 250-ETRN
>> 250-ENHANCEDSTATUSCODES
>> 250-8BITMIME
>> 250 DSN
>>>>> MAIL From:<motor at localhost.localdomain> SIZE=219
>> 250 2.1.0 Ok
>>>>> RCPT To:<larry.martell at gmail.com>
>>>>> DATA
>> 250 2.1.5 Ok
>> 354 End data with <CR><LF>.<CR><LF>
>>>>> .
>> 250 2.0.0 Ok: queued as D26C8830F
>> larry.martell at gmail.com... Sent (Ok: queued as D26C8830F)
>> Closing connection to [127.0.0.1]
>>>>> QUIT
>> 221 2.0.0 Bye
>>
>> 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.
>
> Craig
>
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