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Re: Configuring Exim for mail delivery

From mo <mo777@gmx.net>
Newsgroups linux.debian.user
Subject Re: Configuring Exim for mail delivery
Date 2016-10-01 13:50 +0200
Message-ID <snqXL-7RK-13@gated-at.bofh.it> (permalink)
References <sncBs-6LW-5@gated-at.bofh.it> <snhKO-1ya-1@gated-at.bofh.it> <snpS2-7al-23@gated-at.bofh.it> <snqEp-7JI-3@gated-at.bofh.it>
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Am 01.10.2016 um 13:22 schrieb Brian:
> On Sat 01 Oct 2016 at 12:36:10 +0200, mo wrote:
>
>>> I just figured out how to get this working myself a week or two back, so
>>> it's fresh in my mind. The key trick is the use of "hubbed hosts".
>>
>> Did you follow a specific book or guide?
>
> The manual for exim4-config_files is the first place to look.
>

I will look into the manual.
I also found a book about exim from O'Reilly, it's quite old (2001) but 
i guess i can get some info out of it.

>>> Exim configuration has the concept of "routers" and "transports".
>>> Routers basically decide what to do with a message, and transports do
>>> it. One of the routers configured by default in the Debian exim
>>> configuration is for "hubbed hosts". What this means, is machines
>>> capable of sending and receiving email ("hosts" in exim speak) that are
>>> on the same LAN as this machine (connected by a "hub"). Note that this
>>> "hub" could be your local home network router, and for these purposes
>>> machines on WiFi and machines on a wired LAN would be considered on the
>>> same hub, even though that isn't strictly true. The point is that
>>> network packets can be addressed directly between the machines, they
>>> don't require a router in between.
>>>
>>
>> As far as i do understand this is that only machines which are defined as
>> hubbed hosts can be send mail in the local LAN? Or am i misunderstanding
>> something here? :)
>
> hubbed_hosts can send mail wherever you want. For example:
>
>   example.com: smtp.example.com
>
> would send mail to someone at example.com through smtp.example.com
> (which could be a smarthost).
>

Got it, thanks ;)

>>> In Debian, this is achieved with Avahi. This is what allows you, if you
>>> have MachineA and MachineB on your network, to do for example "ping
>>> MachineA.local" from MachineB and expect MachineA.local to be resolved
>>> into an IP address.
>>>
>>
>> I'm not a friend of avahi to be honest, i much rather ignore it :D
>
> Let's hope your IP addresses do not change.
>

No changes here, static network configuration, so that should not pose 
problems. (My network only has 4 machines, so DHCP is not needed, at 
least atm i don't need it :) )

>>> In /etc/exim4, create a file owned by root called hubbed_hosts. In the
>>> file, each line maps a "domain" (the part after the @ sign in an email
>>> address) to a "host" (the name of a machine on your network, as it can
>>> be reached from this machine). Put the domain first, then a tab
>>> character (spaces may also be OK) and then the host. So for example I
>>> have a machine on my network called affinity, and so in the hubbed_hosts
>>> file on the machine I am sitting in front of now, I have two lines, one
>>> saying "affinity.local<TAB>affinity.local", and the other saying
>>> "affinity<TAB>affinity.local" (no quotes in the file). This tells the
>>> local exim installation that any email address with @affinity.local as
>>> the domain should be forwarded on to a machine called affinity.local,
>>> and any mail with @affinity as the domain should be forwarded on to a
>>> machine called affinity.local. Exim4 will then say "Connect to
>>> affinity.local!" with no attempt to translate that into an IP address,
>>> and Avahi daemon will answer "that is IP address WW.XX.YY.ZZ!" to which
>>> exim will say "very well, connect to WW.XX.YY.ZZ!" and the exim4 on
>>> affinity will wake up and co-operate to deliver the mail.
>>
>> I just did that and now mailing works flawlessly :D
>> Just one questions: Why do i need hubbed_host entries? Should it not be fine
>> alone to make a entry in /etc/hosts for the machines i want to send mail to
>> (I do not operate a dedicated DNS server).
>> This is something i dont really understand...
>
> I'd suggest you try it and look at the logs.
>

I will try that out, exim has a pretty nice logging format i think ;)

Greets

mo

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Thread

Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-09-30 22:30 +0200
  Re: Configuring Exim for mail delivery Liam O'Toole <liam.p.otoole@gmail.com> - 2016-10-01 00:50 +0200
  Re: Configuring Exim for mail delivery Mark Fletcher <mark27q1@gmail.com> - 2016-10-01 04:00 +0200
    Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 12:40 +0200
      Re: Configuring Exim for mail delivery Brian <ad44@cityscape.co.uk> - 2016-10-01 13:30 +0200
        Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 13:50 +0200
          Re: Configuring Exim for mail delivery Clive Menzies <clive@clivemenzies.co.uk> - 2016-10-01 14:00 +0200
            Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 14:10 +0200
          Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 14:10 +0200
          Re: Configuring Exim for mail delivery Mark Fletcher <mark27q1@gmail.com> - 2016-10-01 14:10 +0200
      Re: Configuring Exim for mail delivery Mark Fletcher <mark27q1@gmail.com> - 2016-10-01 14:30 +0200
        Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 14:40 +0200
          Re: Configuring Exim for mail delivery Mark Fletcher <mark27q1@gmail.com> - 2016-10-01 15:00 +0200
            Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 15:00 +0200
        Re: Configuring Exim for mail delivery Brian <ad44@cityscape.co.uk> - 2016-10-01 15:00 +0200
          Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 15:10 +0200
          Re: Configuring Exim for mail delivery Mark Fletcher <mark27q1@gmail.com> - 2016-10-01 15:40 +0200
            Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 16:20 +0200
            Re: Configuring Exim for mail delivery Brian <ad44@cityscape.co.uk> - 2016-10-01 16:40 +0200
      Re: Configuring Exim for mail delivery Teemu Likonen <tlikonen@iki.fi> - 2016-10-01 16:00 +0200
        Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 16:20 +0200
  Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 11:10 +0200
    Re: Configuring Exim for mail delivery Brian <ad44@cityscape.co.uk> - 2016-10-01 12:10 +0200
      Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 12:40 +0200
      Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 14:10 +0200
        Re: Configuring Exim for mail delivery Brian <ad44@cityscape.co.uk> - 2016-10-01 14:30 +0200
          Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 14:30 +0200
            Re: Configuring Exim for mail delivery Mark Fletcher <mark27q1@gmail.com> - 2016-10-01 15:00 +0200
              Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 15:10 +0200
      Re: Configuring Exim for mail delivery Mark Fletcher <mark27q1@gmail.com> - 2016-10-01 14:10 +0200
    Re: Configuring Exim for mail delivery Mark Fletcher <mark27q1@gmail.com> - 2016-10-01 13:40 +0200
      Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 14:10 +0200
    Re: Configuring Exim for mail delivery rhkramer@gmail.com - 2016-10-01 14:20 +0200
      Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 16:30 +0200
    Re: Configuring Exim for mail delivery Liam O'Toole <liam.p.otoole@gmail.com> - 2016-10-01 18:30 +0200
      Re: Configuring Exim for mail delivery Brian <ad44@cityscape.co.uk> - 2016-10-01 20:20 +0200
        Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 22:50 +0200
          Re: Configuring Exim for mail delivery Brian <ad44@cityscape.co.uk> - 2016-10-02 00:30 +0200
            Re: Configuring Exim for mail delivery Mark Fletcher <mark27q1@gmail.com> - 2016-10-02 02:30 +0200
              Re: Configuring Exim for mail delivery Liam O'Toole <liam.p.otoole@gmail.com> - 2016-10-02 13:10 +0200
            Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-02 10:50 +0200
        Re: Configuring Exim for mail delivery Liam O'Toole <liam.p.otoole@gmail.com> - 2016-10-01 23:10 +0200
          Re: Configuring Exim for mail delivery Brian <ad44@cityscape.co.uk> - 2016-10-02 00:40 +0200
            Re: Configuring Exim for mail delivery Liam O'Toole <liam.p.otoole@gmail.com> - 2016-10-02 02:10 +0200
              Re: Configuring Exim for mail delivery Brian <ad44@cityscape.co.uk> - 2016-10-02 14:00 +0200
                Re: Configuring Exim for mail delivery Mark Fletcher <mark27q1@gmail.com> - 2016-10-02 14:50 +0200
                Re: Configuring Exim for mail delivery Gene Heskett <gheskett@shentel.net> - 2016-10-02 15:20 +0200
                Re: Configuring Exim for mail delivery Mark Fletcher <mark27q1@gmail.com> - 2016-10-02 15:50 +0200
                Re: Configuring Exim for mail delivery Brian <ad44@cityscape.co.uk> - 2016-10-02 15:40 +0200
                Re: Configuring Exim for mail delivery Liam O'Toole <liam.p.otoole@gmail.com> - 2016-10-02 17:30 +0200
      Re: Configuring Exim for mail delivery mo <mo777@gmx.net> - 2016-10-01 22:50 +0200

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