On common OS names, I have an ISP client who blocks Administrator@ (both in
and out). They claim it reduces a whole load of problems with misconfigured
Exchange / AD servers living on client LANs.

Also make sure messages to abuse@ also feeds into your Abuse dept. as well
as going to your client. 

Ken.

On Tue, 2017-07-25 at 10:23 -0700, Michael Peddemors wrote:
> Our standards are that the main domain on the email server should haveĀ 
> 'postmaster','abuse','mailer-daemon', as well as any common OS names, egĀ 
> 'root','postgres','www-data' etc created and restricted.
> 
> All subsequent domains should have 'abuse' and 'postmaster'.

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