Re: [exim] Internal un-exist user keep sending mail

Loke wrote:
> Hi,
>
> I have multiple domains in my shared hosting server.
> Recently I encounter there is a lot of mail that send from the internal
> domain (un-exist user), to either exist or unexist users (blackhole) within
> the domain.
>
> Kindly advice is that anyway to prevent the mail sent out from the un-exist
> users.
>
> Loke

Use SMTP authentication to prevent non-existent or unauthorized users from sending mail from your system.

http://www.exim.org/exim-html-current/doc/html/spec_html/ch33.html