Slightly OT: Postfix smtpd restrictions

[Jason Ede]

This is purely MTA based, but since a lot of users here run postfix...

How have others found reject_unknown_reverse_client_hostname and the more harsh reject_unknown_client_hostname  in postfix? I'm debating implementing them here and wonder if others have found them problematic or useful? I thinking they should be good for weeding out spam emails and I can't see that they should catch legitimate senders, but want to be sure.

Jason
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