The Exim FAQ

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Q0201:  How can I arrange that messages larger than some limit are handled by a special router?

A0201:  You can use a condition option on the router line this:

   condition = ${if >{$message_size}{100K}{yes}{no}}

Q0202:  Can I specify a list of domains to explicitly reject?

A0202:  Set up a named domain list containing the domains in the first section of the configuration, for example:

   domainlist reject_domains = list:of:domains:to:reject

You can use this list in an ACL to reject any SMTP recipients in those domains. You can also give a customized error message, like this:

   deny message = The domain $domain is no longer supported
        domains = +reject_domains

If you also want to reject these domains in messages that are submitted from the command line (not using SMTP), you need to set up a router to do it, like this:

     driver = redirect
     domains = +reject_domains
     data = :fail: The domain $domain is no longer supported

Q0203:  How can I arrange to do my own qualification of non-fully-qualified domains, and then pass them on to the next router?

A0203:  If you have some list of domains that you want to qualify, you can do this using a redirect router. For example,

     driver = redirect
     domains = *.a.b
     data = ${quote:$local_part}@$

This adds to any domain that matches *.a.b. If you want to do this in conjunction with a dnslookup router, the widen_domains option of that router may be another way of achieving what you want.

Q0204:  Every system has a nobody account under which httpd etc run. I would like to know how to restrict mail which comes from that account to users on that host only.

A0204:  Set up a first router like this:

      driver = redirect
      senders = nobody@your.domain
      domains = ! +local_domains
      data = :fail: Nobody may not mail off-site

This assumes you have defined +local_domains as in the default configuration.

Q0205:  How can I get Exim to deliver to me locally and everyone else at the same domain via SMTP to the MX record specified host?

A0205:  Create an accept router to pick off the one address and pass it to an appropriate transport. Put this router before the one that does MX routing:

     driver = accept
     domains =
     local_parts = me
     transport = local_delivery

In the transport you will have to specify the user option. An alternative way of doing this is to add a condition to the router that does MX lookups to make it skip your address. Subsequent routers can then deliver your address locally. You'll need a condition like this:

   condition = \
     ${if and {{eq{$domain}{}}{eq{$local_part}{me}}}{no}{yes}}

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