On Sun, Apr 13, 2014 at 03:26:43PM +0200, Thijssen wrote:
> OK, nobody has anything to say on this?

The post contained a lot of misunderstanding, and it is difficult to 
know where to begin, but I'll make at least an initial try.

> On Fri, Apr 11, 2014 at 1:13 AM, Thijssen <jul...@gmail.com> wrote:
> > We decided to create a special MX for just the bulk mailings

This is unclear. "MX" is about receiving mail, but it sounds like you 
are talking about sending bulk mail?

> > within our IP-block, the datacentre network we maintain. Here's
> > where my questions arise:
> >
> > The setup is as follows:
> > - We have many servers within the same range, 10.20.30.x (I'll
> > use IPv4 only for ease now),
> > some of them have websites and/or are shared hosting servers
> > that are using a SaaS home-made mailing-GUI for their
> > newsletters and similar high volume recipient list mails.

You are an ESP? Or is this all in-house?

> > - Our primary MX that needs to send out the bulk for them all is 
> >

I guess you mean MTA, not MX.

> > - Is there a way to NOT have to tell postfix to allow the sending 
> > domain names, but just the server's IP-addresses that hold those 
> > who'd like to send out those mails via ?

Where did you get the idea that Postfix is checking sender domain 
names? By default this is not so.

> > I would basically like them to use any (valid domain's)
> > from-field they want, and postfix would have to allow it
> > because the source is one of our own servers.
> How do I configure that?

Perhaps you want to look up postconf.5.html#mynetworks ... linked 
from the Basic readme:


> The postfix config mentions 'relay domains', an IP address is
> not a domain.

Right, and relay_domains is about receiving mail, not sending.

> > Below is my config, it does not want to relay mail from those 
> > local servers and I'm not sure why.

You did not show logs.

> > Do I really have to note down all from-field domains as allowed 

Of course not.

> > or what is the best way to accomplish this? I have commented
> > out a lot in this config, because I'm working on getting it
> > as perfect as possible for our purpose.
> >
> > Thanks in advance for any and all feedback on this config,
> > feel free to add improvements:
> > [root@somemailer~]# cat /etc/postfix/main.cf

The list welcome message and DEBUG_README.html#mail both tell you 
*NOT* to do this. Send "postconf -n", and include logs which show 
the problem you are having.

General advice: hire a good ESP to handle your bulk mail sending 
needs. Three [mostly-]well-regarded ESPs I can recommend, in no 
particular order: Mailchimp, Sendgrid, Constant Contact. They know 
mail, and they have relationships with large receivers. If revenue
depends on your bulk mail, their fees will be money well spent.

(Perhaps they have reseller arrangements, if that is what's 
appropriate in your case.)

Anyway, mynetworks (and the permit_mynetworks restriction) is the 
answer to the question as posed, so I'll stop here.
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