Matt wrote:

> I have a few users that have a certain anti-junkmail software.  It
> supposeably bounces junkmail.  The theory is that the spammer will get
> the bounce and think the email address is no longer valid and remove it
> from there list.  I am so sure that happens.  In reality most times the

Sturgeon's Revelation.

> Is there anyway to setup Exim so when it sees a return address of "<>"
> and its not addressed to a local user or from exim itself refuse it?

Sure, but you should be very careful about that or you will block
legitimate bounces and probably end up in the rfc-ignorant list. And you
should make sure that none of your clients use a MTA (they could send
valid bounces) or some redirection/notify/vacation/whatever that uses
the empty sender.

If you want your "no spams from local users", you could use in your
acl_check_rcpt:

deny
  message = no bounces from clients
  senders = :
  ! domains = +local_domains

Or if your clients do smtp auth:

deny
  senders = :
  authenticated = *

or some other condition to determine people that should never send
bounces. But please be careful.


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