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.

--
-Eric 'shubes'

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