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From: Oguz Yilmaz on 21 Jun 2010 07:58
Hi,

In some of my setups, I locate postfix as content filtering for smtp,
and before the original mail server.

internet -> postfix relay -> mail server

In cases of "myhostname=mail.mydomain.com" and also the hostname of
the mail server is "mail.mydomain.com" Postfix will give an error of
"greeted me with my own hostname" and bounce the e-mail with "loops
back to myself". Actually this is not a real loopback case.

Is it possible to disable checking for the corresponding hostname of
the transport?

Best Regards,

Oguz Yilmaz




Postfix 2.2.11

warning: host 10.15.0.10[10.15.0.10] greeted me with my own hostname
mail.mydomain.com
warning: host 10.15.0.10[10.15.0.10] replied to HELO/EHLO with my own
hostname mail.mydomain.com
6E0E31C3AC7: to=<test(a)mydomain.com>, relay=10.15.0.10[10.15.0.10],
delay=5, status=bounced (mail for 10.15.0.10 loops back to myself)


fallback_transport = maildrop
mydestination = localhost, localdomain, localhost.localdomain, $myhostname
mydomain = mydomain.com
myhostname = mail.mydomain.com
mynetworks = 127.0.0.1, 10.0.0.0/8
relay_domains = $mydestination, mydomain.com
smtp_host_lookup = native, dns
transport_maps = hash:/etc/postfix/transport


transport:
mydomain.com smtp:10.15.0.10
..mydomain.com smtp:10.15.0.10

From: Wietse Venema on 21 Jun 2010 08:20
Oguz Yilmaz:
> Hi,
>
> In some of my setups, I locate postfix as content filtering for smtp,
> and before the original mail server.
>
> internet -> postfix relay -> mail server
>
> In cases of "myhostname=mail.mydomain.com" and also the hostname of
> the mail server is "mail.mydomain.com" Postfix will give an error of
> "greeted me with my own hostname" and bounce the e-mail with "loops
> back to myself". Actually this is not a real loopback case.

Use different myhostname settings for different MTA instances.
Each name should match the inet_interfaces setting of its MTA.

Wietse

From: Oguz Yilmaz on 23 Jun 2010 14:47
For the case, mail server is not necessarily a Postfix. Yes it is a
workaround to find different myhostname variable setting then hostname
of the real mail server.

internet -> postfix relay -> mail server
mail.mydomain.com mail.mydomain.com

However, this needs a control:
- new myhostname should resolv to the same IP and the IP to the same
myhostname for a best practice antispam configuration.
- The customer may not have any other hostname defined in the DNS.
So, those cases will need a control and will not work seamlessly.

I just wanted to ask If Is there a way to disable "loops back to
myself" errors in a case which is not actually a real loop back.

Thanks Mr. Venema.

Best Regards,


On Mon, Jun 21, 2010 at 3:20 PM, Wietse Venema <wietse(a)porcupine.org> wrote:
> Oguz Yilmaz:
>> Hi,
>>
>> In some of my setups, I locate postfix as content filtering for smtp,
>> and before the original mail server.
>>
>> internet -> postfix relay -> mail server
>>
>> In cases of "myhostname=mail.mydomain.com" and also the hostname of
>> the mail server is "mail.mydomain.com" Postfix will give an error of
>> "greeted me with my own hostname" and bounce the e-mail with "loops
>> back to myself". Actually this is not a real loopback case.
>
> Use different myhostname settings for different MTA instances.
> Each name should match the inet_interfaces setting of its MTA.
>
>        Wietse
>

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