RE: [exim] Way to Prevent Spoofed Internal Addresses?

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Autor: Mark Smith
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A: '.|MoNK|Cucumber .', exim-users
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Assumpte: RE: [exim] Way to Prevent Spoofed Internal Addresses?

> You could try something like this:
>
>   deny
>     authenticated = *
>     !senders = $authenticated_id
>     message = Aliases not allowed

>
> However, a problem with Outlook is that when it receives a
> "deny", instead of reporting the error message from the MTA
> it just tries to send the email again from any other accounts
> it can find, until it succeeds in sending the email. If
> anyone knows how to stop it doing that, I'd appreciate
> hearing the solution.
>


Just realized that if you put the test in the MAIL_FROM ACL, rather than
RCPT, Outlook reports the error properly and gives up.

- Mark