Quoting Sysadmin (eduardo.silvestre@???):
> Any clue about this?
Relaying is usually controlled in the RCPT ACL. In a default setup it
usually already has some configuration along the lines of:
accept hosts = +relay_from_hosts
Just before that you could create a new 'accept' statement which has a
'condition =' test in which you can expand, lookup and compare certain
values. If the condition is true, the message is accepted.
Earlier tests in the RCPT ACL should ensure your system is capable of
routing the message onward (see 'require verify = recipient').
This all is explained thoroughly in The Fine Documentation:
About ACLs in a more general form:
https://8n1.org/9153/8924
About 'lists' of hosts, domains and lookups on them:
https://8n1.org/9155/dfbf
And about string expansion:
https://8n1.org/9154/22d3 which you'd have
to use in your 'condition ='-test. Please note this URL also lists the
available functions and operators which would aid you in your quest.
Word of warning: test your conditions thoroughly or you might open your
servers to relaying for unwelcome sources. You can test your conditions
by using 'warn' instead of accept:
warn log_message = Debugoutput
condition = ..
Also, people tend to forget how usefull 'exim4 -bh $ipaddress' is.
HTH,
-Sndr.
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