Kevin Colagio wrote:
> What I'd like to do is have Exim only check local sender addresses
> and if it's not a valid address, reject the message. However, I'm
> not sure how to do this. Has anyone implemented something like this?
>
> Of course, if there's another way to do the same type of thing, I'd
> be interested in hearing it.
That'll be something along these lines, then...
# Deny if the claimed sender address is in one of our "relay to" domains
but
# cannot be verified to exist ("relay from" hosts are exempted as
"trusted")
deny message = Invalid local sender address: $sender_address does not
exist
sender_domains = +relay_to_domains
!hosts = +relay_from_hosts
!verify = sender/callout=20s,defer_ok,no_cache
log_message = Invalid local sender address: $sender_address
Depending on your circumstances, I think you may want to look at
local_domains as well as or instead of relay_to_domains (no doubt
someone will correct me if I've got that wrong!).
Of course, this doesn't help you if the sender address is forged as
something that _does_ exist.
HTH
Richard
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Richard Rogers
IT Development and Innovation Manager
Staffordshire University
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