Re: Postfix config - cron messages for root going to root@ISP.

From: Doug Laidlaw (laidlaws_at_myaccess.com.au)
Date: 02/25/05 

Date: Sat, 26 Feb 2005 01:39:59 +1100

Yamaska wrote:

> Doug Laidlaw wrote:
>> I have installed Postfix on Mandrake 10.1, with the settings recommended
>> by R.P. Goldman at
>> http://rpgoldman.real-time.com/linux/postfix-linux.html
>> designed specifically for Mandrake. Among his settings he recommends
>> setting myorigin to be isp.net, so that my emails will appear to be from
>> me@myisp.net and less likely to be rejected as bogus.
>>
>> According to a posting on a SuSe list, the result of this is to make
>> root's emails go in the mail queue to root@isp.net, so the ISP gets them,
>> regardless of any aliases saying that root's emails should go to my user
>> inbox. This has happened to me twice, and I was only doing what the
>> howto
>> said. Apparently myorigin should be mybox.myisp.net, but this
>> contradicts Goldman's reason for doing it the other way to begin with.
>>
>> What is the correct setup?
>>
>> Doug.
>
> If you don't plan on using postfix for your own domainname, you might as
> well use the SMTP service that your ISP provides.
>
> It's not a smart move to "fake" your ISP's domainname on your mailserver
> and a good way of getting yourself blacklisted with your ISP.
>
> So either use localhost (for local messaging) or use a domainname for
> sending mail to external recipients.
>
> If your mailserver is not secure enough and you keep using your ISP's
> domainname,.. they could end up getting blacklisted of your server get's
> hacked for spam/relay purposes.
>
> Just my 2 cents
>
> Pete
Thanks Pete.

I am using SMTP for sending emails, but am using postfix to download mail on
a regular basis. That is probably unnecessary. The problem is, that
although I am not using postfix to send external emails, it is still there,
and is sending out these Cron messages.

I don't see why Goldman needs to do it if he is using an ordinary e-mail
client. He is implying that emails created by my e-mail client (kmail)
which has a standard SMTP configuration, will somehow be altered to show my
(bogus) domain name as the origin, instead of, or in addition to the one in
kmail's setup. That would prevent them from being sent at all. It is true
that my domain name will appear in other headers. Others have suggested
that the correct setting is mybox.<ISPdomain> . That seems to have nothing
to commend it, and I have seen no reason given. I propose to follow
Postfix's setup config, which will ensure that cron messages are directed
to my local hostname and protect my account for the time being, and I am
emailing Goldman.

Doug. 

-- 
ICQ Number 178748389. Registered Linux User No. 277548.
Anger is one letter away from danger.
        - Eleanor Roosevelt.

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