> From: Ben

> I would like to restrict all SMTP and local submission to be able to 
> send mail to certain domains ONLY.
> 
> E.g. only allow sending/relay to example.com, example1.com, 
> example2.com, nothing else.

> From: Viktor Dukhovni

> Instead of using ACLs, which seem sensibly to apply primarily to SMTP,
> use an Exim "router" to deliver the desired domains normally, while
> routing everything else to the bit bucket.

> You should be able to use the append transport with a destination
> file of /dev/null for all domains except those that you want to be
> handled normally.

...
domainlist good = example.com : example1.com : example2.com
begin acl
...

begin routers
discard:
  driver = redirect
  domains = ! +good
  data = :blackhole:

...


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