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Re: [exim4] mixed up about terminology



On Mon 06 Oct 2014 at 11:05:17 -0400, Jerry Stuckle wrote:

> On 10/6/2014 10:25 AM, Brian wrote:
> > On Mon 06 Oct 2014 at 09:04:14 -0400, Jerry Stuckle wrote:
> > 
> >> On 10/5/2014 11:31 PM, Chris Bannister wrote:
> >>>
> >>> Good point. Just to be pedantic all MTAs act as relays, but I think the
> >>> term being talked about is "open relay" IOW it's "open" for anybody to
> >>> use, spammers, guy next door etc. etc.
> >>
> >> One correction - all MTAs *CAN* act as relays.  But sending a message
> >> from the sender's MTA to the recipient's MTA is generally not considered
> >> "relaying".  A relay would be when there is a third (or fourth or
> >> fifth...) MTA between the sender's and recipient's.
> > 
> > This has prompts one to consider at what point in a ten person relay
> > race could "relaying" be regarded as starting.
> 
> What does this have to do with MTA setup?  Are you just trying to cover
> up your ignorance by changing the subject.

I was bemused by your interpretation of the common English word "relay"
and fell into a state of deep contemplation. Promise it won't happen
again.

> >> Only under special conditions would a relay be required. The most
> >> obvious one I can think of is a large company with multiple sites; all
> >> mail would go to ???@example.com, which would be one MTA.  But this MTA
> >> would then relay messages to MTAs at local sites around the world.  And
> >> the reverse would happen for messages being sent by employees.
> > 
> > All the OP wants to do is set up a smarthost for clients on his home
> > network. Now he's informed it doesn't meet the "special conditions"
> > criterion.
> 
> Then why are you suggesting he set up dc_relay_nets?  Maybe because you
> don't know what you're talking about?

You'll have noticed the suggestion for dc_relay_nets hasn't just been
made by me in this thread. We'll start with what the OP said earlier:

 > I do want to be able to use this server as the smart host for my other
 > lan machines.

Then a quick look at update-exim4.conf(8):

   dc_relay_nets
          A list of machines for which we serve as smarthost.

That looks ideal, doesn't it?


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