On 05/30/2014 04:13 PM, Les Fenison wrote:
However, I have still had issues where spammers send with matching
to/from addresses Evidently plesk doesn't handle this. And of course,
this should ONLY happen for unauthenticated users as some people send to
themselves to test.
I've found that provided all users authenticate properly and they only
submit via your server (and they should if they don't), blacklisting
your local domains works well to block this type of spam. Authenticated
users can still send to themselves since they authenticate, and messages
that illegitimately masquerade as your domain(s) are blocked.
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