Re: exim router configuration

[Noah K Sematimba <ksemat at wawa.eahd.or.ug>]

Thanks a lot. This really helps. I think the exim manual is about to
become my bedtime story :-)

Apparently one of my questions is on the FAQ though for exim3. I guess I
need to RTFM a bit.

I haven't found this one though in the exim 4 FAQ and I am sure I am not
the only one to have had it.

What is the default limit for max no of concurrent sessions from a
particular host?

Many of my clients seem to be reaching this limit pretty quickly.
What parameter can I use to change it?




Noah.

On Wed, 21 Aug 2002, Brian Candler wrote:

> On Wed, Aug 21, 2002 at 11:53:52AM +0300, Noah K Sematimba wrote:
> > I currently have:
> >
> > accept hosts = +relay_from_hosts
> >        sender_domains = +source_domains
> >
> > This restriction is working very well and a lot of spam has actually been
> > dropped.
> >
> > Is there a way to also add particular users to be able to send through the
> > mail server. i.e. I may not want every user on a particular domain to be
> > able to send through my mail server but only particular users. In this
> > case I have a user whose e-mail is hosted with another ISP however he gets
> > his link and relays his mail through me. So i would not like to enable
> > every user on that ISP's domain to relay through my server even though
> > they come from my network but only this particular user/users.
>
> In other words, you want to allow MAIL FROM:<foo at hotmail.com> but not
> MAIL FROM:<anythingelse at hotmail.com> ?
>
> Take a closer read of the documentation section on 'ACL conditions',
> http://www.exim.org/exim-html-4.00/doc/html/spec_37.html#SECT37.9
> The condition 'sender' lets you test the entire sender address, not just the
> domain.
>
> Try something like this (not tested so you may need to fiddle with it):
>
>   accept hosts  = +relay_from_hosts
>          sender = : lsearch* at ;/usr/local/etc/exim/senders
>
> where this file can contain "foo at hotmail.com" or "* at example.com"
> The extra colon is to allow null (empty) senders, i.e. allow bounces
> to be relayed. Using the lsearch* at  means that if foo at bar is not found in
> this file, it automatically retries looking for * at bar. Hence this file can
> replace your source_domains functionality as well.
>
> If this list gets big, turn it into a dbm file for efficiency.
>
> Note that you can use 'exim -bh 1.2.3.4' to fake an SMTP session from
> 1.2.3.4, which gives an easy way for testing your SMTP ACLs.
>
> > As for the routers I settled for this.
> >
> > smtp_paths
> >           driver = manualroute
> >           transport = remote_smtp
> >           domains = lsearch;/usr/local/etc/exim/transport
> >           route_data = x.x.x.x
> >
> > How would I be able to chaneg this to having the route data also read from
> > the transport file as well for example have the file looking like:
> >
> > domain.net:	w.x.y.z
> >
> >
> > where domain.net is the domain being routed and w.x.y.z is the particular
> > ip address the mail is being delivered to.
>
> Something like this:
>
> smtp_paths:
>     driver = manualroute
>     route_data = ${lookup{$domain}lsearch{/usr/local/etc/exim/transport}}
>     transport = remote_smtp
>
> which is the same as the example for route_data given in section 19.1 of the
> exim manual, or the example "through_firewall:" in section 19.6
>
> (Yes, it's all in the manual. Yes, it's a big manual - but it pays to learn
> your way around it).
>
> This router will be tried for all domains, but if the route_data lookup
> fails, or gives an empty string, the router will 'decline' and so exim will
> move onto the next router.
>
> In fact, with exim 4.10, you can also override the transport in this file
> (see section 19.5): i.e.
>
>     domain.net    w.x.y.z       remote_smtp
>     example.com   sparky.uucp   uucp
>
> which gives you a feature very much like the 'mailertable' of sendmail,
> except you can use any lookup type (dbm, ldap, mysql etc) to hold this data.
>
> HTH,
>
> Brian.
>


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