[pfx] Re: Contradicting Postfix documentation

Tue, 02 May 2023 20:52:04 -0700

This looks a network and config issue rather than any defect in PF be that with the code or the docs...
I would highly recommend you crawl before you try running so with that in mind, scale back your config to just use v4 and get that working. Also, if you really want help on this mailer, post both your main and master config files so the community understands exactly what your system is cfg’d to do. Otherwise, it is doubtful folks will wanna spend the time especially when your position is that you don’t need to put in the same effort we all have done - i.e. seeing value in RTFM. 


I can truly say that in the 13+ years I’ve been using PF, all of the 
config and operational issues I’ve had were covered in the docs…


- - -

On 2 May 2023, at 20:28, Kolusion K via Postfix-users wrote:


Disabling IPv6 probably isn't an acceptable workaround anyway. What 
happens if both an IPv4 and IPv6 IP address is listed? Postfix may 
still use other network interfaces not listed (IP addresses).



Changing the parameter name wouldn't be a bad idea either seeing 
parameter values are actually IP addresses and not interface names, as 
the parameter name suggests.


K




Sent: Wednesday, May 03, 2023 at 5:11 am
From: "Kolusion K via Postfix-users" <postfix-users@postfix.org>
To: postfix-users@postfix.org

Subject: [pfx] Fw: Re: Fw: Re: Re: Contradicting Postfix 
documentation



Postfix needs to be patched so that the value of the inet_interfaces 
parameter is obeyed regardless of whether or not IPv6 (or other IP 
versions?) is enabled.


K




Sent: Wednesday, May 03, 2023 at 4:57 am
From: "Kolusion K via Postfix-users" <postfix-users@postfix.org>
To: "Viktor Dukhovni via Postfix-users" <postfix-users@postfix.org>
Subject: [pfx] Re: Fw: Re: Re: Contradicting Postfix documentation


Its not naive, its a fact- Postfix is broken. The inet_interfaces 
parameter is described in the documentation as making Postfix use 
only the interfaces listed for the parameter. In reality, Postfix 
ignores the parameter by using network interfaces that are not 
listed.



There is nothing mentioned in the Postfix documentation under the 
inet_interfaces parameter section that says the inet_interfaces 
parameter is for IPv4 only and that it will not have an effect on 
IPv6 interfaces. That claim is your fairy tale.



K




Sent: Tuesday, May 02, 2023 at 5:57 pm

From: "Viktor Dukhovni via Postfix-users" 
<postfix-users@postfix.org>

To: postfix-users@postfix.org
Subject: [pfx] Re: Fw: Re: Re: Contradicting Postfix documentation


On Tue, May 02, 2023 at 04:45:13PM +0200, Kolusion K via 
Postfix-users wrote:



Hang on a second... my Postfix is using a network interface that 
is
not the one set with the inet_interfaces parameter. So, my 
experience

is true- the inet_interfaces parameter has no effect.



No, it has exactly the documented effects, perhaps different from 
your
naïve expectations for your particular use case.  This is not the 
forum

to seek "validation", the most you can expect from this list is

technical help to configure Postfix to meet your stated 
requirements.



    - The IPv4 addresses listed in inet_interfaces have no effect 
on

      the choice of outbound IPv6 address when IPv6 is enabled.


    - When inet_interfaces list no IPv4 addresses other than 
loopback
      addresses, or lists multiple non-loopback IPv4 addresses, 
then
      inet_interfaces also has no effect on the choice of outbound 
IPv4

      addresses.

- To be sure that a particular IPv4 or IPv6 source address is used,

  configure an explicit "smtp_bind_address" or 
"smtp_bind_address6".

- To be sure that IPv6 is not used, set "inet_protocols = ipv4".
- To be sure that IPv4 is not used, set "inet_protocols = ipv6".

- If you have just one IPv4 address suitable for both sending and

  receiving mail, set it as the only IPv4 address in 
inet_interfaces.

  You then don't need an explicit "smtp_bind_address", though an
  explicit setting may be sensible in some cases.
- If you have just one IPv6 address suitable for both sending and

  receiving mail, set it as the only IPv6 address in 
inet_interfaces.

  You then don't need an explicit "smtp_bind_address6", though an
  explicit setting may be sensible in some cases.

- In either case disable any protocol that is not at all suitable 
for

  receiving or sending email.

--
    Viktor.
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